staging: imx-drm: ipu-common: Remove unused variable

Fix the following warning when building with W=1 option:

drivers/staging/imx-drm/ipu-v3/ipu-common.c: In function 'ipu_remove':
drivers/staging/imx-drm/ipu-v3/ipu-common.c:1145:19: warning: variable 'res' set but not used [-Wunused-but-set-variable]
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/imx-drm/ipu-v3/ipu-common.c

@@ -1142,9 +1142,6 @@ static int ipu_probe(struct platform_device *pdev)
 static int ipu_remove(struct platform_device *pdev)
 {
 	struct ipu_soc *ipu = platform_get_drvdata(pdev);
-	struct resource *res;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
 	platform_device_unregister_children(pdev);
 	ipu_submodules_exit(ipu);