checkpatch: switch indent allow plain return

It is a common and sane idiom to allow a single return on the end of a
case statement:

	switch (...) {
	case foo:	return bar;
	}

Add an exception for this.
Signed-off-by: NAndy Whitcroft <apw@shadowen.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -1295,7 +1295,11 @@ sub process {
 			}
 		}
 		if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
-		    $line !~ /\G(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$/g) {
+		    $line !~ /\G(?:
+			(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
+			\s*return\s+
+		    )/xg)
+		{
 			ERROR("trailing statements should be on next line\n" . $herecurr);
 		}