spi/stmicro: fix debug() display of cmd

The stmicro_wait_ready() func tries to show the actual opcode that was sent
to the device, but instead it displays the array pointer.  Fix it to pull
out the opcode from the start of the array.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

drivers/mtd/spi/stmicro.c

@@ -137,7 +137,7 @@ static int stmicro_wait_ready(struct spi_flash *flash, unsigned long timeout)
 
 	ret = spi_xfer(spi, 32, &cmd[0], NULL, SPI_XFER_BEGIN);
 	if (ret) {
-		debug("SF: Failed to send command %02x: %d\n", cmd, ret);
+		debug("SF: Failed to send command %02x: %d\n", cmd[0], ret);
 		return ret;
 	}