dont return error if there are no events on wanpipe_poll, it may be an async signal on the wanpipe device

git-svn-id: http://svn.openzap.org/svn/openzap/branches/sangoma_boost@950 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/freetdm/src/ozmod/ozmod_wanpipe/ozmod_wanpipe.c

@@ -855,9 +855,8 @@ ZIO_SPAN_POLL_EVENT_FUNCTION(wanpipe_poll_event)
 			k++;
 		}
 	}
-	
-
-	return k ? ZAP_SUCCESS : ZAP_FAIL;
+	/* when k is 0 it might be that an async wanpipe device signal was delivered */	
+	return ZAP_SUCCESS;
 }
 
 /**