renderonly: don't complain when GPU import fails

There are a number of drivers which do a trial-and-error import
of buffers into the KMS side via renderonly. Some of those imports
are expected to fail, so we should not print a error message in
this case. All callers do proper error handling themselves.

Cc: mesa-stable
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12018>
(cherry picked from commit 1bc22a2eab)

.pick_status.json

@@ -283,7 +283,7 @@
         "description": "renderonly: don't complain when GPU import fails",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null
     },

src/gallium/auxiliary/renderonly/renderonly.c

@@ -134,10 +134,8 @@ renderonly_create_gpu_import_for_resource(struct pipe_resource *rsc,
    err = drmPrimeFDToHandle(ro->kms_fd, fd, &scanout->handle);
    close(fd);
 
-   if (err < 0) {
-      fprintf(stderr, "drmPrimeFDToHandle() failed: %s\n", strerror(errno));
+   if (err < 0)
       goto free_scanout;
-   }
 
    return scanout;