call: avoid deadlock on hangup

This patch move checkAudio() out of call mutex. Because it could cause
deadlock if subcallStateChanged() called at the same time.

Change-Id: Iee06874fb79c8e0953e061f7a669b3f61f13d8b9

src/call.cpp

@@ -152,7 +152,6 @@ Call::removeCall()
     setState(CallState::OVER);
     if (Recordable::isRecording())
         Recordable::stopRecording();
-    Manager::instance().checkAudio();
 }
 
 const std::string&

src/sip/sipcall.cpp

@@ -762,6 +762,7 @@ SIPCall::sendTextMessage(const std::map<std::string, std::string>& messages,
 
 void
 SIPCall::removeCall()
+{
     {
         std::lock_guard<std::recursive_mutex> lk {callMutex_};
         JAMI_WARN("[call:%s] removeCall()", getCallId().c_str());
@@ -770,6 +771,8 @@ SIPCall::removeCall()
         inv.reset();
         setTransport({});
     }
+    Manager::instance().checkAudio();
+}
 
 void
 SIPCall::onFailure(signed cause)