remove an unused variable

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66240 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

regparse.c

@@ -5825,7 +5825,6 @@ node_extended_grapheme_cluster(Node** np, ScanEnv* env)
   Node* tmp = NULL;
   Node* np1 = NULL;
   Node* top_alt = NULL;
-  BBuf *pbuf1 = NULL;
   int r = 0;
   int num1;
   int i;
@@ -6054,7 +6053,6 @@ node_extended_grapheme_cluster(Node** np, ScanEnv* env)
 
  err:
   onig_node_free(np1);
-  bbuf_free(pbuf1);
   for (i=0; i<NODE_COMMON_SIZE; i++)
     onig_node_free(node_common[i]);
   return (r == 0) ? ONIGERR_MEMORY : r;