68328fb: fix cmap memory leaks

- fix cmap leak in removal path

- fix cmap leak when register_framebuffer fails

- check return value of fb_alloc_cmap
Signed-off-by: NAndres Salomon <dilinger@debian.org>
Acked-by: NKrzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/68328fb.c

@@ -471,9 +471,11 @@ int __init mc68x328fb_init(void)
 	fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
 	fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 
-	fb_alloc_cmap(&fb_info.cmap, 256, 0);
+	if (fb_alloc_cmap(&fb_info.cmap, 256, 0))
+		return -ENOMEM;
 
 	if (register_framebuffer(&fb_info) < 0) {
+		fb_dealloc_cmap(&fb_info.cmap);
 		return -EINVAL;
 	}
 
@@ -494,6 +496,7 @@ module_init(mc68x328fb_init);
 static void __exit mc68x328fb_cleanup(void)
 {
 	unregister_framebuffer(&fb_info);
+	fb_dealloc_cmap(&fb_info.cmap);
 }
 
 module_exit(mc68x328fb_cleanup);