vesafb: fix memory leak

When releasing framebuffer, free colourmap allocations.
Signed-off-by: NDaniel J Blueman <daniel.blueman@gmail.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

drivers/video/vesafb.c

@@ -175,6 +175,7 @@ static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 
 static void vesafb_destroy(struct fb_info *info)
 {
+	fb_dealloc_cmap(&info->cmap);
 	if (info->screen_base)
 		iounmap(info->screen_base);
 	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);