unused variable removed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10152 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

parse.y

@@ -4990,7 +4990,7 @@ parser_regx_options(struct parser_params *parser)
 
     int kcode   = 0;
     int options = 0;
-    int c, opt, kc, found;
+    int c, opt, kc;
 
     newtok();
     while (c = nextc(), ISALPHA(c)) {