OMAPDSS: remove extra out == NULL checks

All the output drivers check for 'out' being NULL, but it can never be
NULL. Remove the check.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
diff --git a/drivers/video/fbdev/omap2/dss/dsi.c b/drivers/video/fbdev/omap2/dss/dsi.c
index b3606de..59065e1 100644
--- a/drivers/video/fbdev/omap2/dss/dsi.c
+++ b/drivers/video/fbdev/omap2/dss/dsi.c
@@ -3833,7 +3833,7 @@
 	u16 word_count;
 	int r;
 
-	if (out == NULL || out->manager == NULL) {
+	if (out->manager == NULL) {
 		DSSERR("failed to enable display: no output/manager\n");
 		return -ENODEV;
 	}