c-common.c (c_expand_expr): Remove code to return a value different from that returned by expand_expr.

	* c-common.c (c_expand_expr): Remove code to return a value
	different from that returned by expand_expr.
	* expr.c (store_expr): Use the validity of a target MEM, rather
	than checking DECL_RTL (exp), to figure out if a copy is
	required.

From-SVN: r75273