Fix sync issue in virNetClientStreamEventRemoveCallback

The stream lock is unlocked twice instead of being locked and then
unlocked. Probably a typo.
(cherry picked from commit 107f51b6)

Conflicts:

	AUTHORS

AUTHORS

@@ -195,6 +195,7 @@ Patches have also been contributed by:
   Xu He Jie            <xuhj@linux.vnet.ibm.com>
   Lei Li               <lilei@linux.vnet.ibm.com>
   Matthias Witte       <witte@netzquadrat.de>
+  Radu Caragea         <dmns_serp@yahoo.com>
 
   [....send patches to get your name here....]
 

src/rpc/virnetclientstream.c

@@ -507,7 +507,7 @@ int virNetClientStreamEventRemoveCallback(virNetClientStreamPtr st)
 {
     int ret = -1;
 
-    virMutexUnlock(&st->lock);
+    virMutexLock(&st->lock);
     if (!st->cb) {
         virNetError(VIR_ERR_INTERNAL_ERROR,
                     "%s", _("no stream callback registered"));