lib/string_helpers: fix some kerneldoc warnings

Due to some sad limitations in how kerneldoc comments are parsed, the
documentation in lib/string_helpers.c generates these warnings:

  lib/string_helpers.c:236: WARNING: Unexpected indentation.
  lib/string_helpers.c:241: WARNING: Block quote ends without a blank line; unexpected unindent.
  lib/string_helpers.c:446: WARNING: Unexpected indentation.
  lib/string_helpers.c:451: WARNING: Block quote ends without a blank line; unexpected unindent.
  lib/string_helpers.c:474: WARNING: Unexpected indentation.

Rework the comments to obtain something like the desired result.

Link: http://lkml.kernel.org/r/20190607110952.409011ba@lwn.netSigned-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/string_helpers.c

@@ -231,35 +231,36 @@ static bool unescape_special(char **src, char **dst)
  * @src:	source buffer (escaped)
  * @dst:	destination buffer (unescaped)
  * @size:	size of the destination buffer (0 to unlimit)
- * @flags:	combination of the flags (bitwise OR):
- *	%UNESCAPE_SPACE:
+ * @flags:	combination of the flags.
+ *
+ * Description:
+ * The function unquotes characters in the given string.
+ *
+ * Because the size of the output will be the same as or less than the size of
+ * the input, the transformation may be performed in place.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will always be NULL-terminated. Source string must be
+ * NULL-terminated as well.  The supported flags are::
+ *
+ *	UNESCAPE_SPACE:
  *		'\f' - form feed
  *		'\n' - new line
  *		'\r' - carriage return
  *		'\t' - horizontal tab
  *		'\v' - vertical tab
- *	%UNESCAPE_OCTAL:
+ *	UNESCAPE_OCTAL:
  *		'\NNN' - byte with octal value NNN (1 to 3 digits)
- *	%UNESCAPE_HEX:
+ *	UNESCAPE_HEX:
  *		'\xHH' - byte with hexadecimal value HH (1 to 2 digits)
- *	%UNESCAPE_SPECIAL:
+ *	UNESCAPE_SPECIAL:
  *		'\"' - double quote
  *		'\\' - backslash
  *		'\a' - alert (BEL)
  *		'\e' - escape
- *	%UNESCAPE_ANY:
+ *	UNESCAPE_ANY:
  *		all previous together
  *
- * Description:
- * The function unquotes characters in the given string.
- *
- * Because the size of the output will be the same as or less than the size of
- * the input, the transformation may be performed in place.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will always be NULL-terminated. Source string must be
- * NULL-terminated as well.
- *
  * Return:
  * The amount of the characters processed to the destination buffer excluding
  * trailing '\0' is returned.
@@ -441,7 +442,29 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
  * @isz:	source buffer size
  * @dst:	destination buffer (escaped)
  * @osz:	destination buffer size
- * @flags:	combination of the flags (bitwise OR):
+ * @flags:	combination of the flags
+ * @only:	NULL-terminated string containing characters used to limit
+ *		the selected escape class. If characters are included in @only
+ *		that would not normally be escaped by the classes selected
+ *		in @flags, they will be copied to @dst unescaped.
+ *
+ * Description:
+ * The process of escaping byte buffer includes several parts. They are applied
+ * in the following sequence.
+ *
+ *	1. The character is matched to the printable class, if asked, and in
+ *	   case of match it passes through to the output.
+ *	2. The character is not matched to the one from @only string and thus
+ *	   must go as-is to the output.
+ *	3. The character is checked if it falls into the class given by @flags.
+ *	   %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
+ *	   character. Note that they actually can't go together, otherwise
+ *	   %ESCAPE_HEX will be ignored.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will not be NULL-terminated, thus caller have to append
+ * it if needs.   The supported flags are::
+ *
  *	%ESCAPE_SPACE: (special white space, not space itself)
  *		'\f' - form feed
  *		'\n' - new line
@@ -464,26 +487,6 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
  *		all previous together
  *	%ESCAPE_HEX:
  *		'\xHH' - byte with hexadecimal value HH (2 digits)
- * @only:	NULL-terminated string containing characters used to limit
- *		the selected escape class. If characters are included in @only
- *		that would not normally be escaped by the classes selected
- *		in @flags, they will be copied to @dst unescaped.
- *
- * Description:
- * The process of escaping byte buffer includes several parts. They are applied
- * in the following sequence.
- *	1. The character is matched to the printable class, if asked, and in
- *	   case of match it passes through to the output.
- *	2. The character is not matched to the one from @only string and thus
- *	   must go as-is to the output.
- *	3. The character is checked if it falls into the class given by @flags.
- *	   %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
- *	   character. Note that they actually can't go together, otherwise
- *	   %ESCAPE_HEX will be ignored.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will not be NULL-terminated, thus caller have to append
- * it if needs.
  *
  * Return:
  * The total size of the escaped output that would be generated for