spi: omap2-mcspi: Handle error on gpio_request

If a valid GPIO is specified but cannot be requested by the driver, print a
message and error out of omap2_mcspi_setup.
Signed-off-by: Michael Welling <mwelling@ieee.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-omap2-mcspi.c

@@ -1023,9 +1023,12 @@ static int omap2_mcspi_setup(struct spi_device *spi)
 	}
 
 	if (gpio_is_valid(spi->cs_gpio)) {
-		if (gpio_request(spi->cs_gpio, dev_name(&spi->dev)) == 0)
-			gpio_direction_output(spi->cs_gpio,
-			!(spi->mode & SPI_CS_HIGH));
+		ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
+		if (ret) {
+			dev_err(&spi->dev, "failed to request gpio\n");
+			return ret;
+		}
+		gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
 	}
 
 	ret = pm_runtime_get_sync(mcspi->dev);