spi: quad: Fix missing return

Delete a "return" when commit the patch to a new kernel version
 by mistake. So recover it.

Signed-off-by: wangyuhang <wangyuhang2014@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 50f7fc3..f0a6582 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1463,6 +1463,7 @@
 			return -EINVAL;
 		if (xfer->speed_hz && master->max_speed_hz &&
 		    xfer->speed_hz > master->max_speed_hz)
+			return -EINVAL;
 
 		if (xfer->tx_buf && !xfer->tx_nbits)
 			xfer->tx_nbits = SPI_NBITS_SINGLE;