[MTD] m25p80.c code cleanup

code cleanup for m25p80.c

Signed-off-by: Chen Gong <g.chen@freescale.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 8fbd1b5..b2b58c1 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -134,7 +134,7 @@
 {
 	u8	code = OPCODE_WREN;
 
-	return spi_write_then_read(flash->spi, &code, 1, NULL, 0);
+	return spi_write(flash->spi, &code, 1);
 }