stmt.c (expand_return): Don't return anything if size is zero.

stmt.c (expand_return): Don't return anything if size is zero.

	* stmt.c (expand_return): Don't return anything if size is zero.
	Delete redundant assignment to BYTES.
	* expr.c (move_block_from_reg): Do nothing if NREGS is zero.

From-SVN: r39156