tgafb: fix cmap memory leak

Fix cmap leak when register_framebuffer fails.
Signed-off-by: NAndres Salomon <dilinger@debian.org>
Acked-by: NKrzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/tgafb.c

@@ -1663,7 +1663,7 @@ tgafb_register(struct device *dev)
 	if (register_framebuffer(info) < 0) {
 		printk(KERN_ERR "tgafb: Could not register framebuffer\n");
 		ret = -EINVAL;
-		goto err1;
+		goto err2;
 	}
 
 	if (tga_bus_pci) {
@@ -1682,6 +1682,8 @@ tgafb_register(struct device *dev)
 
 	return 0;
 
+ err2:
+	fb_dealloc_cmap(&info->cmap);
  err1:
 	if (mem_base)
 		iounmap(mem_base);