datapath-windows: Solved memory leak in OVS datapath

When closing opened instances, make sure the user dump state is cleared.

Signed-off-by: Sorin Vinturis <svinturis@cloudbasesolutions.com>
Reported-by: Sorin Vinturis <svinturis@cloudbasesolutions.com>
Reported-at: openvswitch/ovs-issues#90
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

datapath-windows/ovsext/Datapath.c

@@ -588,6 +588,7 @@ OvsRemoveOpenInstance(PFILE_OBJECT fileObject)
     OvsReleaseCtrlLock();
     ASSERT(instance->eventQueue == NULL);
     ASSERT (instance->packetQueue == NULL);
+    FreeUserDumpState(instance);
     OvsFreeMemoryWithTag(instance, OVS_DATAPATH_POOL_TAG);
 }