checkpatch: fix typo in comment

Link: http://lkml.kernel.org/r/20170902175249.15bb77f2@endymion
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -2875,7 +2875,7 @@ sub process {
 #	#defines that are a single string
 #
 # There are 3 different line length message types:
-# LONG_LINE_COMMENT	a comment starts before but extends beyond $max_linelength
+# LONG_LINE_COMMENT	a comment starts before but extends beyond $max_line_length
 # LONG_LINE_STRING	a string starts before but extends beyond $max_line_length
 # LONG_LINE		all other lines longer than $max_line_length
 #