sm501fb: check fb_alloc_cmap return value and handle failure properly

Signed-off-by: NAndres Salomon <dilinger@debian.org>
Acked-by: NKrzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/sm501fb.c

@@ -1525,7 +1525,10 @@ static int sm501fb_init_fb(struct fb_info *fb,
 	}
 
 	/* initialise and set the palette */
-	fb_alloc_cmap(&fb->cmap, NR_PALETTE, 0);
+	if (fb_alloc_cmap(&fb->cmap, NR_PALETTE, 0)) {
+		dev_err(info->dev, "failed to allocate cmap memory\n");
+		return -ENOMEM;
+	}
 	fb_set_cmap(&fb->cmap, fb);
 
 	ret = (fb->fbops->fb_check_var)(&fb->var, fb);