peer_connection: shutdown socket on io error

If a write operation fails on a ICE Transport, the transport
just fail but do not shutdown as other components can be created
or used. So, the error must be catched on another level.
IceSocketEndpoint is the socket we use to send data. If a write
fails at this point this means the ICE must be closed

Change-Id: I6e67cb003df2a9855e8293f4753d1bc4fe75e340

src/peer_connection.cpp

@@ -129,7 +129,9 @@ IceSocketEndpoint::read(ValueType* buf, std::size_t len, std::error_code& ec)
             return 0;
         try {
             auto res = ice_->recvfrom(compId_, reinterpret_cast<char*>(buf), len, ec);
-            return (res >= 0) ? res : 0;
+            if (res < 0)
+                shutdown();
+            return res;
         } catch (const std::exception& e) {
             JAMI_ERR("IceSocketEndpoint::read exception: %s", e.what());
         }
@@ -148,10 +150,11 @@ IceSocketEndpoint::write(const ValueType* buf, std::size_t len, std::error_code&
         res = ice_->send(compId_, reinterpret_cast<const unsigned char*>(buf), len);
         if (res < 0) {
             ec.assign(errno, std::generic_category());
+            shutdown();
         } else {
             ec.clear();
         }
-        return (res >= 0) ? res : 0;
+        return res;
     }
     return -1;
 }