spi: fsl-dspi: several minor improvements and fixes

 - improve dependencies using COMPILE_TEST
 - fix a typo
 - drop platform_set_drvdata(pdev, NULL) in error path of probe
 - make MODULE_LICENSE match the header
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NMark Brown <broonie@linaro.org>

drivers/spi/Kconfig

@@ -264,6 +264,7 @@ config SPI_FSL_SPI
 config SPI_FSL_DSPI
 	tristate "Freescale DSPI controller"
 	select SPI_BITBANG
+	depends on SOC_VF610 || COMPILE_TEST
 	help
 	  This enables support for the Freescale DSPI controller in master
 	  mode. VF610 platform uses the controller.

drivers/spi/spi-fsl-dspi.c

@@ -165,7 +165,7 @@ static void hz_to_spi_baud(char *pbr, char *br, int speed_hz,
 			}
 		}
 
-	pr_warn("Can not find valid buad rate,speed_hz is %d,clkrate is %ld\
+	pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld\
 		,we use the max prescaler value.\n", speed_hz, clkrate);
 	*pbr = ARRAY_SIZE(pbr_tbl) - 1;
 	*br =  ARRAY_SIZE(brs) - 1;
@@ -526,7 +526,6 @@ static int dspi_probe(struct platform_device *pdev)
 	clk_disable_unprepare(dspi->clk);
 out_master_put:
 	spi_master_put(master);
-	platform_set_drvdata(pdev, NULL);
 
 	return ret;
 }
@@ -553,5 +552,5 @@ static struct platform_driver fsl_dspi_driver = {
 module_platform_driver(fsl_dspi_driver);
 
 MODULE_DESCRIPTION("Freescale DSPI Controller Driver");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:" DRIVER_NAME);