qemu_command: Resolve Coverity DEADCODE
qemu_command: Resolve Coverity DEADCODE

One useless warning, but the other one rather pertinent. On entry
the 'trans' variable is initialized to VIR_DOMAIN_DISK_TRANS_DEFAULT.
When the "trans" was found in the parsing loop it def->geometry.trans
was assigned to the return from virDomainDiskGeometryTransTypeFromString
and then 'trans' was used to do the comparison to see if it was valid.

So remove 'trans' and use def->geometry.trans properly

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