(check_methods_accessible): Fix bug in -Wno-protocol.

(check_methods_accessible): Fix bug in -Wno-protocol.  Reset chain to
bottom class for each search.

From-SVN: r5927

gcc/objc/objc-act.c

@@ -5363,9 +5363,11 @@ check_methods_accessible (chain, context, mtype)
 {
   int first = 1;
   tree list;
+  tree base_context = context;
 
   while (chain)
     {
+      context = base_context;
       while (context)
 	{
 	  if (mtype == '+')