[libvirt] [PATCH]: Allow arbitrary paths to virStorageVolLookupByPath

[Chris Lalancette]

Daniel P. Berrange wrote:
>> Personally, I think those are bad semantics for virStorageBackendStablePath;
>> assuming it succeeds, you should always be able to know that you have a copy,
>> regardless of whether the copy is the same as the original.  Should I change
>> virStorageBackendStablePath to those semantics, in which case your below code
>> would then be correct?
> 
> Yes, I think that's worth doing - will also avoid the cast in the input
> arg there

OK, updated patch attached; virStorageBackendStablePath now always returns a
copy of the given string, so it's always safe to unconditionally VIR_FREE it.  I
fixed up storage_backend_iscsi and storage_backend_disk to reflect this change.
 I also re-worked the code as you suggested, and added a bit more error checking.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
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