qemu_migration.c: modernize qemuMigrationDstPersist()
qemu_migration.c: modernize qemuMigrationDstPersist()

Use g_autoptr() and remove the 'cleanup' label.

Signed-off-by: Daniel Henrique Barboza <627b089ad62deae9aaf06ccfa2c9056df28927e0@gmail.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

jardasgit/libvirt,zippy2/libvirt,jfehlig/libvirt,jfehlig/libvirt,jardasgit/libvirt,zippy2/libvirt,olafhering/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,nertpinx/libvirt,crobinso/libvirt,jardasgit/libvirt,olafhering/libvirt,jardasgit/libvirt,zippy2/libvirt,crobinso/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,libvirt/libvirt,libvirt/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,nertpinx/libvirt,jardasgit/libvirt