util: eliminate crash in virNetDevMacVLanCreateWithVPortProfile
Commit 723d5c (added after the release of 0.9.10) adds a NetlinkEventClient for each interface sent to virNetDevMacVLanCreateWithVPortProfile. This should only be done if the interface actually *has* a virtPortProfile, otherwise the event handler would be a NOP. The bigger problem is that part of the setup to create the NetlinkEventClient is to do a memcpy of virtPortProfile - if it's NULL, this triggers a segv. This patch just qualifies the code that adds the client - if virtPortProfile is NULL, it's skipped.
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