[PATCH] scripts: checkpatch.pl add warning for dummy label

[Nitin Kuppelur <nitinkuppelur@gmail.com>]

Added new warning DUMMY_LABEL in checkpatch.pl. This warns
if return statement is encountered just after goto label target
like "out:". In such scenario it is best to call "return;" directly
instead of "goto out;"

Signed-off-by: Nitin Kuppelur <nitinkuppelur@gmail.com>
---
 scripts/checkpatch.pl | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b602ed2..399c2b5 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3798,10 +3798,14 @@ sub process {
 		if ($sline =~ /^[ \+]}\s*$/ &&
 		    $prevline =~ /^\+\treturn\s*;\s*$/ &&
 		    $linenr >= 3 &&
-		    $lines[$linenr - 3] =~ /^[ +]/ &&
-		    $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
-			WARN("RETURN_VOID",
-			     "void function return statements are not generally useful\n" . $hereprev);
+		    $lines[$linenr - 3] =~ /^[ +]/) {
+			if ($lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
+				WARN("RETURN_VOID",
+				     "void function return statements are not generally useful\n" . $hereprev);
+			} elsif ($lines[$linenr - 3] =~ /^[ +]\s*$Ident\s*:/) {
+				WARN("DUMMY_LABEL",
+				     "labels doing nothing are not generally useful\n" . $hereprev);
+			}
                }
 
 # if statements using unnecessary parentheses - ie: if ((foo == bar))
-- 
1.9.1