drm: qxl: add missing return check

My static checker complains that "release" is uninitialized if
qxl_alloc_release_reserved() fails, so let's add a check for that.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170314075410.GB5984@mwanda
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 9548bb5..058340a 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -572,6 +572,8 @@ static void qxl_cursor_atomic_update(struct drm_plane *plane,
        ret = qxl_alloc_release_reserved(qdev, sizeof(*cmd),
                                         QXL_RELEASE_CURSOR_CMD,
                                         &release, NULL);
+       if (ret)
+               return;
 
        cmd = (struct qxl_cursor_cmd *) qxl_release_map(qdev, release);