usb-mtp: fix return status of delete
Spotted by Coverity: CID 1399414 mtp delete allows the return status of delete succeeded, partial_delete or readonly - when none of the objects could be deleted. Give more meaningful names to return values of the delete function. Some initiators recurse over the objects themselves. In that case, only READ_ONLY can be returned. Signed-off-by: NBandan Das <bsd@redhat.com> Message-Id: <20190401211712.19012-2-bsd@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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