vsprintf.c: use default pointer field size for "(null)" strings

It might be nicer to align the output.

For instance, ACPI messages sometimes have "(null)" pointers.

$ dmesg | grep "(null)"  -A 1 -B 1
[    0.198733] ACPI: Dynamic OEM Table Load:
[    0.198745] ACPI: SSDT (null) 00239 (v02  PmRef  Cpu0Ist 00003000 INTL 20051117)
[    0.199294] ACPI: SSDT 7f596e10 001C7 (v02  PmRef  Cpu0Cst 00003001 INTL 20051117)
[    0.200708] ACPI: Dynamic OEM Table Load:
[    0.200721] ACPI: SSDT (null) 001C7 (v02  PmRef  Cpu0Cst 00003001 INTL 20051117)
[    0.201950] ACPI: SSDT 7f597f10 000D0 (v02  PmRef  Cpu1Ist 00003000 INTL 20051117)
[    0.203386] ACPI: Dynamic OEM Table Load:
[    0.203398] ACPI: SSDT (null) 000D0 (v02  PmRef  Cpu1Ist 00003000 INTL 20051117)
[    0.203871] ACPI: SSDT 7f595f10 00083 (v02  PmRef  Cpu1Cst 00003000 INTL 20051117)
[    0.205301] ACPI: Dynamic OEM Table Load:
[    0.205315] ACPI: SSDT (null) 00083 (v02  PmRef  Cpu1Cst 00003000 INTL 20051117)

[akpm@linux-foundation.org: add code comment]
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/vsprintf.c

@@ -988,8 +988,15 @@ static noinline_for_stack
 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	      struct printf_spec spec)
 {
-	if (!ptr)
+	if (!ptr) {
+		/*
+		 * Print (null) with the same width as a pointer so it makes
+		 * tabular output look nice.
+		 */
+		if (spec.field_width == -1)
+			spec.field_width = 2 * sizeof(void *);
 		return string(buf, end, "(null)", spec);
+	}
 
 	switch (*fmt) {
 	case 'F':
@@ -1031,7 +1038,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	}
 	spec.flags |= SMALL;
 	if (spec.field_width == -1) {
-		spec.field_width = 2*sizeof(void *);
+		spec.field_width = 2 * sizeof(void *);
 		spec.flags |= ZEROPAD;
 	}
 	spec.base = 16;