util: Fix possible leak in virResctrlAllocMasksAssign
util: Fix possible leak in virResctrlAllocMasksAssign

Found by coverity.

Signed-off-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

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