checkpatch: handle comment/quote nesting correctly

Ensure that a close comment cannot incorrectly trigger in the middle of a
string.  Reported by Jaswinder Singh.
Signed-off-by: NAndy Whitcroft <apw@shadowen.org>
Cc: Jaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -335,7 +335,7 @@ sub sanitise_line {
 			$off++;
 			next;
 		}
-		if (substr($line, $off, 2) eq '*/') {
+		if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 			$sanitise_quote = '';
 			substr($res, $off, 2, "$;$;");
 			$off++;