Let's remove the error message that appears when the tree_id is not
present. This can happen with the quota tree and has been observed in
practice. The applications are supposed to handle -ENOENT and we don't
need to report that in the system log as it's not a fatal error.
Reported-by: NVlastimil Babka <vbabka@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>