If we hit an error here, then we should unlock and unreference obj
before returning.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index 852642d..6de6130 100644
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -210,7 +210,7 @@ int udl_gem_mmap(struct drm_file *file, struct drm_device 
*dev,
 
        ret = udl_gem_get_pages(gobj, GFP_KERNEL);
        if (ret)
-               return ret;
+               goto out;
        if (!gobj->base.map_list.map) {
                ret = drm_gem_create_mmap_offset(obj);
                if (ret)
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