spi: loopback-test: don't skip comparing the first byte of rx_buf

When the loopback parameter is set, rx_buf are compared with tx_buf
after the spi_message is executed. But the first byte of buffer is
not checked.

Signed-off-by: Akinobu Mita <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-loopback-test.c

···
 			continue;
 		/* so depending on tx_buf we need to handle things */
 		if (xfer->tx_buf) {
-			for (i = 1; i < xfer->len; i++) {
+			for (i = 0; i < xfer->len; i++) {
 				txb = ((u8 *)xfer->tx_buf)[i];
 				rxb = ((u8 *)xfer->rx_buf)[i];
 				if (txb != rxb)