virStorageFileGetMetadataRecurse: Remove impossible error report
We call virStorageFileSupportsBackingChainTraversal which already checks that the 'storageFileRead' callback is non-NULL, which in turn means that virStorageFileRead will not return -2. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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