Fix a memory leak found by Hui Zhu <teawater@gmail.com>.

	Fix a memory leak found by Hui Zhu <teawater@gmail.com>.
	* c-exp.y (parse_number): Move the S and SAVED_CHAR initialization
	after the DECFLOAT detection to fix a memory leak.  Remove the
	redundant NUM initialization.  Protect the DECFLOAT detection memory
	access before the P block.  Restore the P memory content for the
	DECFLOAT detection.