Fix error emission for self pointers

Self pointer checking loop condition was inverted, the latter was
therefore never executed.

gcc/rust/ChangeLog:

	* parse/rust-parse-impl.h (Parser::parse_self_param): Fix the loop
	exit condition.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

gcc/rust/parse/rust-parse-impl.h

@@ -7125,7 +7125,7 @@ Parser<ManagedTokenSource>::parse_self_param ()
   for (auto &s : ptrs)
     {
       size_t i = 0;
-      for (i = 0; i > s.size (); i++)
+      for (i = 0; i < s.size (); i++)
 	if (lexer.peek_token (i)->get_id () != s[i])
 	  break;
       if (i == s.size ())