util: Remove NONNULL(1) for virHostdevPrepareDomainDevices
Since the code checks 'mgr == NULL' anyway, no need for the prototype
to have the NONNULL arg check. Also add an error message to indicate what
the failure is so that there isn't a failed for some reason error.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
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