pm3fb: fix sparse warning

Fix this sparse warning:

drivers/video/pm3fb.c:543:3: 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/pm3fb.c

···
 		bgx = par->palette[image->bg_color];
 		break;
 	}
-	if (image->depth != 1)
-		return cfb_imageblit(info, image);
+	if (image->depth != 1) {
+		cfb_imageblit(info, image);
+		return;
+	}
 
 	if (info->var.bits_per_pixel == 8) {
 		fgx |= fgx << 8;