fbdev: fsl-diu: remove redundant null check on cmap

The null check on &info->cmap is redundant since cmap is a struct
inside fb_info and can never be null, so the check is always true.
We may remove it.
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Acked-by: Timur Tabi <timur@kernel.org>
Cc: zhong.weidong@zte.com.cn
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/fsl-diu-fb.c

@@ -1575,8 +1575,7 @@ static void uninstall_fb(struct fb_info *info)
 
 	unregister_framebuffer(info);
 	unmap_video_memory(info);
-	if (&info->cmap)
-		fb_dealloc_cmap(&info->cmap);
+	fb_dealloc_cmap(&info->cmap);
 
 	mfbi->registered = 0;
 }