drivers/video: fsl-diu-fb: fix compilation warning

Fix this compilation warning in the Freescale DIU framebuffer driver:

warning: 'dummy_ad_addr' may be used uninitialized in this function
Signed-off-by: NTimur Tabi <timur@freescale.com>
Signed-off-by: NFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>

drivers/video/fsl-diu-fb.c

@@ -1429,7 +1429,7 @@ static int __devinit fsl_diu_probe(struct platform_device *ofdev)
 {
 	struct device_node *np = ofdev->dev.of_node;
 	struct mfb_info *mfbi;
-	phys_addr_t dummy_ad_addr;
+	phys_addr_t dummy_ad_addr = 0;
 	int ret, i, error = 0;
 	struct resource res;
 	struct fsl_diu_data *machine_data;