Bug#18396 Identifiers: Byte with value 255 not allowed

Old FRM files didn't allow byte 255 as a column name part.
Since now we store column names in UTF8, this restriction
is not required anymore: 255 is not a valid byte in UTF8.
Fix: removing checking against 255.

mysql-test/r/ctype_latin1.result

@@ -391,3 +391,17 @@ ABC
 SELECT convert(@str collate latin1_swedish_ci using utf8);
 convert(@str collate latin1_swedish_ci using utf8)
 ABC ߲~    @ abc
+SET NAMES latin1;
+DROP TABLE IF EXISTS `abcdef`;
+CREATE TABLE `abcdef` (i int);
+INSERT INTO `abcdef` VALUES (1);
+INSERT INTO abcdef VALUES (2);
+SELECT * FROM `abcdef`;
+i
+1
+2
+SELECT * FROM abcdef;
+i
+1
+2
+DROP TABLE `abcdef`;

mysql-test/t/ctype_latin1.test

@@ -110,3 +110,14 @@ SELECT convert(@str collate latin1_german2_ci using utf8);
 SELECT convert(@str collate latin1_swedish_ci using utf8);
 
 # End of 4.1 tests
+
+SET NAMES latin1;
+--disable_warnings
+DROP TABLE IF EXISTS `abcdef`;
+--enable_warnings
+CREATE TABLE `abcdef` (i int);
+INSERT INTO `abcdef` VALUES (1);
+INSERT INTO abcdef VALUES (2);
+SELECT * FROM `abcdef`;
+SELECT * FROM abcdef;
+DROP TABLE `abcdef`;

sql/sql_lex.cc

@@ -804,8 +804,6 @@ int MYSQLlex(void *arg, void *yythd)
 	int length;
 	if ((length= my_mbcharlen(cs, c)) == 1)
 	{
-	  if (c == (uchar) NAMES_SEP_CHAR)
-	    break; /* Old .frm format can't handle this char */
 	  if (c == quote_char)
 	  {
 	    if (yyPeek() != quote_char)