spi: spi-qcom-qspi: Add newline to PIO fallback warning

A warning added in commit b5762d95 ("spi: spi-qcom-qspi: Add DMA
mode support") was missing a newline. Add it.
Reported-by: Stephen Boyd <swboyd@chromium.org>
Closes: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4573857/comment/44331d65_79128099/
Fixes: b5762d95 ("spi: spi-qcom-qspi: Add DMA mode support")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230530111348.1.Ibd1f4827e18a26dc802cd6e5ac300d83dc1bc41c@changeidSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-qcom-qspi.c

@@ -445,7 +445,7 @@ static int qcom_qspi_transfer_one(struct spi_master *master,
 				qcom_qspi_dma_xfer(ctrl);
 			goto exit;
 		}
-		dev_warn_once(ctrl->dev, "DMA failure, falling back to PIO");
+		dev_warn_once(ctrl->dev, "DMA failure, falling back to PIO\n");
 		ret = 0; /* We'll retry w/ PIO */
 	}