conf: Initialize 'deflate' for balloon parse XML
conf: Initialize 'deflate' for balloon parse XML

Commit id '7bf3198df' neglected to initialize deflate leading to a
possibility if model allocation/checks fail, then the VIR_FREE(deflate)
would be erroneous. Noted by Jan Tomko.

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