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block: Fix error path in bdrv_backing_update_filename()
authorKevin Wolf <kwolf@redhat.com>
Mon, 6 Nov 2017 16:52:58 +0000 (17:52 +0100)
committerKevin Wolf <kwolf@redhat.com>
Fri, 17 Nov 2017 12:35:59 +0000 (13:35 +0100)
commit6473069416ddbb0ef4dccca9bffe87c1424f45fa
treefd01c2858fc5c8b21224744fe3e3c45c3ddbf7c7tree
parentc60f6fcfbddccbafc80ae4b3d087406eb7182c3acommit | diff
block: Fix error path in bdrv_backing_update_filename()

error_setg_errno() takes a positive errno code. Spotted by Coverity
(CID 1381628).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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