fbdev: imsttfb: Release framebuffer and dealloc cmap on error path

[ Upstream commit 5cf9a090a39c97f4506b7b53739d469b1c05a7e9 ]

Add missing cleanups in error path.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
diff --git a/drivers/video/fbdev/imsttfb.c b/drivers/video/fbdev/imsttfb.c
index ecdcf35..6589d5f 100644
--- a/drivers/video/fbdev/imsttfb.c
+++ b/drivers/video/fbdev/imsttfb.c
@@ -1452,9 +1452,13 @@
 	              FBINFO_HWACCEL_FILLRECT |
 	              FBINFO_HWACCEL_YPAN;
 
-	fb_alloc_cmap(&info->cmap, 0, 0);
+	if (fb_alloc_cmap(&info->cmap, 0, 0)) {
+		framebuffer_release(info);
+		return -ENODEV;
+	}
 
 	if (register_framebuffer(info) < 0) {
+		fb_dealloc_cmap(&info->cmap);
 		framebuffer_release(info);
 		return;
 	}