qemu: Resolve Coverity FORWARD_NULL
qemu: Resolve Coverity FORWARD_NULL

Coverity notes that ->ifname is used after the VIR_FREE done in the
code path after the call to virNetDevMacVLanDeleteWithVPortProfile
by a call to virNetDevOpenvswitchRemovePort.

Since the ->ifname will be VIR_FREE()'d eventually in virDomainNetDefFree
just remove the extraneous VIR_FREE here.

When originally added, the Openvswitch code wasn't present and checks
were made for non NULL prior to use.

VenkatDatta/libvirt,rlaager/libvirt,crobinso/libvirt,nertpinx/libvirt,olafhering/libvirt,rlaager/libvirt,crobinso/libvirt,agx/libvirt,agx/libvirt,datto/libvirt,jardasgit/libvirt,eskultety/libvirt,VenkatDatta/libvirt,datto/libvirt,libvirt/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,crobinso/libvirt,andreabolognani/libvirt,rlaager/libvirt,andreabolognani/libvirt,eskultety/libvirt,agx/libvirt,taget/libvirt,jfehlig/libvirt,nertpinx/libvirt,andreabolognani/libvirt,datto/libvirt,taget/libvirt,jfehlig/libvirt,libvirt/libvirt,eskultety/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,zippy2/libvirt,libvirt/libvirt,crobinso/libvirt,agx/libvirt,jardasgit/libvirt,nertpinx/libvirt,olafhering/libvirt,zippy2/libvirt,taget/libvirt,andreabolognani/libvirt,olafhering/libvirt,rlaager/libvirt,jfehlig/libvirt,eskultety/libvirt,fabianfreyer/libvirt,libvirt/libvirt,agx/libvirt,fabianfreyer/libvirt,eskultety/libvirt,nertpinx/libvirt,jardasgit/libvirt,olafhering/libvirt,rlaager/libvirt,taget/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,jfehlig/libvirt,datto/libvirt,taget/libvirt,zippy2/libvirt,datto/libvirt,zippy2/libvirt,VenkatDatta/libvirt