virtio_balloon: return the amount of freed memory from leak_balloon()
virtio_balloon: return the amount of freed memory from leak_balloon()

This value would be useful in the next patch to provide the amount of
the freed memory for OOM killer.

Signed-off-by: Raushaniya Maksudova <1342572ca9985a1f5ceb6e7d5cd403f18dbda27e@parallels.com>
Signed-off-by: Denis V. Lunev <0e1ddfe761f44f291037b4efb98a5f5f36ee23b3@openvz.org>
CC: Rusty Russell <df9728c9e5104131c08c7adb03af425394842596@rustcorp.com.au>
CC: Michael S. Tsirkin <255103e50249e3d658441816e0597170ebfc16ef@redhat.com>
Signed-off-by: Rusty Russell <df9728c9e5104131c08c7adb03af425394842596@rustcorp.com.au>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs