skeletonfb: check fb_alloc_cmap return value and handle failure properly

Bad example code, no cookie!

Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/skeletonfb.c

@@ -795,8 +795,9 @@ static int __devinit xxxfb_probe(struct pci_dev *dev,
     if (!retval || retval == 4)
 	return -EINVAL;			
 
-    /* This has to been done !!! */	
-    fb_alloc_cmap(&info->cmap, cmap_len, 0);
+    /* This has to be done! */
+    if (fb_alloc_cmap(&info->cmap, cmap_len, 0))
+	return -ENOMEM;
 
     /* 
      * The following is done in the case of having hardware with a static 
@@ -820,8 +821,10 @@ static int __devinit xxxfb_probe(struct pci_dev *dev,
      */
     /* xxxfb_set_par(info); */
 
-    if (register_framebuffer(info) < 0)
+    if (register_framebuffer(info) < 0) {
+	fb_dealloc_cmap(&info->cmap);
 	return -EINVAL;
+    }
     printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 	   info->fix.id);
     pci_set_drvdata(dev, info); /* or platform_set_drvdata(pdev, info) */