sipcall: reschedule startAllMedias on main thread to avoid deadlock

im::sendSipMessage is locking dialog when callMutex_ is locked, but
handleEvents can lock dialog then callMutex_ in startAllMedias. This
will give a deadlock, so startAllMedias should be rescheduled

Change-Id: I3d1b0b9a981419840f19bfe1832b70503713fe72
Gitlab: #175

src/sip/sipcall.cpp

@@ -1091,22 +1091,21 @@ void
 SIPCall::onMediaUpdate()
 {
     JAMI_WARN("[call:%s] medias changed", getCallId().c_str());
-
+    // Main call (no subcalls) must wait for ICE now, the rest of code needs to access
+    // to a negotiated transport.
+    runOnMainThread([w = weak()] {
+        if (auto this_ = w.lock()) {
             // If ICE is not used, start medias now
-    auto rem_ice_attrs = sdp_->getIceAttributes();
+            auto rem_ice_attrs = this_->sdp_->getIceAttributes();
             if (rem_ice_attrs.ufrag.empty() or rem_ice_attrs.pwd.empty()) {
-        JAMI_WARN("[call:%s] no remote ICE for medias", getCallId().c_str());
-        stopAllMedia();
-        startAllMedia();
+                JAMI_WARN("[call:%s] no remote ICE for medias", this_->getCallId().c_str());
+                this_->stopAllMedia();
+                this_->startAllMedia();
                 return;
             }
-
-    // Main call (no subcalls) must wait for ICE now, the rest of code needs to access
-    // to a negotiated transport.
-    runOnMainThread([w = weak()] {
-        if (auto this_ = w.lock())
             if (not this_->isSubcall())
                 this_->waitForIceAndStartMedia();
+        }
     });
 }