util: Resolve memory leaks in virLogParse{Output|Filter}
util: Resolve memory leaks in virLogParse{Output|Filter}

In both virLogParseOutput and virLogParseFilter, rather than returning
NULL, goto cleanup since it's possible that for each the first condition
passes, but the || condition doesn't and thus we leak memory.

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