checkpatch: fix braces {} handling

checkpatch.pl doesn't report warning for if/else statements with missing
'else' braces:

if (something) {
    foo;
} else
    bar;

The patch has been tested using the last 100 commits.

Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

scripts/checkpatch.pl

@@ -2532,7 +2532,7 @@ sub process {
 						$allowed = 1;
 					}
 				}
-				if (!$seen) {
+				if ($seen != ($#chunks + 1)) {
 					WARN("braces {} are necessary for all arms of this statement\n" . $herectx);
 				}
 			}