FS-10468: [mod_verto] Attended Transfer from Mod Verto leaves one channel in limbo. #resolve

src/mod/endpoints/mod_verto/mod_verto.c

@@ -3115,14 +3115,12 @@ static switch_bool_t attended_transfer(switch_core_session_t *session, switch_co
 
 				result = SWITCH_TRUE;
 				switch_channel_hangup(hup_channel, SWITCH_CAUSE_ATTENDED_TRANSFER);
+				switch_core_session_rwunlock(t_session);
 			} else {
 				result = SWITCH_FALSE;
 			}
 		}
 	}
-	if (b_session) {
-		switch_core_session_rwunlock(b_session);
-	}
 
 	return result;
 }