qemu: save image: Split out checks done only when editing the save img
qemu: save image: Split out checks done only when editing the save img

Move them to the single corresponding function rather than having them
in the common chunk of code.

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