migrate, flow: Trivially succeed if migrating with no flows

We could get a migration request when we have no active flows; or at least
none that we need or are able to migrate.  In this case after sending or
receiving the number of flows we continue to step through various lists.

In the target case, this could include communication with passt-repair.  If
passt-repair wasn't started that could cause further errors, but of course
they shouldn't matter if we have nothing to repair.

Make it more obvious that there's nothing to do and avoid such errors by
short-circuiting flow_migrate_{source,target}() if there are no migratable
flows.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

flow.c

@@ -1019,6 +1019,9 @@ int flow_migrate_source(struct ctx *c, const struct migrate_stage *stage,
 
 	debug("Sending %u flows", ntohl(count));
 
+	if (!count)
+		return 0;
+
 	/* Dump and send information that can be stored in the flow table.
 	 *
 	 * Limited rollback options here: if we fail to transfer any data (that
@@ -1088,6 +1091,9 @@ int flow_migrate_target(struct ctx *c, const struct migrate_stage *stage,
 	count = ntohl(count);
 	debug("Receiving %u flows", count);
 
+	if (!count)
+		return 0;
+
 	if ((rc = flow_migrate_repair_all(c, true)))
 		return -rc;