match: Add missing return statement

This makey the compiler happy.

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

src/match.c

@@ -109,6 +109,7 @@ static int match_pattern(const char *s, const char *pattern) {
   }
 
   /* NOTREACHED */
+  return 0;
 }
 
 /*