amifb: check fb_alloc_cmap return value and handle failure properly

Signed-off-by: Andres Salomon <dilinger@debian.org>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/amifb.c

@@ -2437,7 +2437,9 @@ default_chipset:
 		goto amifb_error;
 	}
 
-	fb_alloc_cmap(&fb_info.cmap, 1<<fb_info.var.bits_per_pixel, 0);
+	err = fb_alloc_cmap(&fb_info.cmap, 1<<fb_info.var.bits_per_pixel, 0);
+	if (err)
+		goto amifb_error;
 
 	if (register_framebuffer(&fb_info) < 0) {
 		err = -EINVAL;
@@ -2456,7 +2458,8 @@ amifb_error:
 
 static void amifb_deinit(void)
 {
-	fb_dealloc_cmap(&fb_info.cmap);
+	if (fb_info.cmap.len)
+		fb_dealloc_cmap(&fb_info.cmap);
 	chipfree();
 	if (videomemory)
 		iounmap((void*)videomemory);