OMAP: DSS2: OMAPFB: fix omapfb_free_fbmem()

Fixes bug causing VRFB memory area to be released twice.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
Reported-by: Eino-Ville Talvala <talvala@stanford.edu>
diff --git a/drivers/video/omap2/omapfb/omapfb-main.c b/drivers/video/omap2/omapfb/omapfb-main.c
index ef29983..e61a75c 100644
--- a/drivers/video/omap2/omapfb/omapfb-main.c
+++ b/drivers/video/omap2/omapfb/omapfb-main.c
@@ -1311,6 +1311,7 @@
 		if (rg->vrfb.vaddr[0]) {
 			iounmap(rg->vrfb.vaddr[0]);
 			omap_vrfb_release_ctx(&rg->vrfb);
+			rg->vrfb.vaddr[0] = NULL;
 		}
 	}