spi: spi_flash: Fix the arguments of stm_is_locked_sr()

stm_is_locked_sr() takes the status register (SR) value as the last
parameter, not the second.

Based on a patch from Brian Norris for the linux kernel:
http://git.infradead.org/linux-mtd.git/commit/a32d5b726ff8cf32bf491522b0ac8ae2545a063eSigned-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: NJagan Teki <jteki@openedev.com>

drivers/mtd/spi/spi_flash.c

@@ -767,8 +767,8 @@ int stm_unlock(struct spi_flash *flash, u32 ofs, size_t len)
 		return ret;
 
 	/* Cannot unlock; would unlock larger region than requested */
-	if (stm_is_locked_sr(flash, status_old, ofs - flash->erase_size,
-			     flash->erase_size))
+	if (stm_is_locked_sr(flash, ofs - flash->erase_size, flash->erase_size,
+			     status_old))
 		return -EINVAL;
 	/*
 	 * Need largest pow such that: