c: Fix up uninitialized next.original_type use in #embed optimization

Jonathan pointed me at a diagnostic from an unnamed static analyzer
which found that next.original_type isn't initialized for the CPP_EMBED
case when it is parsed in a comma expression, yet
  expr.original_type = next.original_type;
is done a few lines later and the expr is returned.

2024-10-16  Jakub Jelinek  <jakub@redhat.com>

	* c-parser.cc (c_parser_expression): Initialize next.original_type
	to integer_type_node for the CPP_EMBED case.

gcc/c/c-parser.cc

@@ -13299,6 +13299,7 @@ c_parser_expression (c_parser *parser)
 	  next.value = build_int_cst (TREE_TYPE (val),
 				      ((const unsigned char *)
 				       RAW_DATA_POINTER (val))[last]);
+	  next.original_type = integer_type_node;
 	  c_parser_consume_token (parser);
 	}
       else