nvidia: fix sparse warnings

Fix this sparse warnings:

drivers/video/nvidia/nv_accel.c:304:3: warning: returning void-valued expression
drivers/video/nvidia/nv_accel.c:323:3: warning: returning void-valued expression

Signed-off-by: Hannes Eder <[e-mail]>
Cc: Krzysztof Helt <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/video/nvidia/nv_accel.c

···
 	if (info->state != FBINFO_STATE_RUNNING)
 		return;
 
-	if (par->lockup)
-		return cfb_copyarea(info, region);
+	if (par->lockup) {
+		cfb_copyarea(info, region);
+		return;
+	}
 
 	NVDmaStart(info, par, BLIT_POINT_SRC, 3);
 	NVDmaNext(par, (region->sy << 16) | region->sx);
···
 	if (info->state != FBINFO_STATE_RUNNING)
 		return;
 
-	if (par->lockup)
-		return cfb_fillrect(info, rect);
+	if (par->lockup) {
+		cfb_fillrect(info, rect);
+		return;
+	}
 
 	if (info->var.bits_per_pixel == 8)
 		color = rect->color;