multiplexed_socket: remove useless shutdown

The shutdown() are useless because the broken pipe error must trigger
a shutdown itself and this can cause some locks when the shutdown
callback is triggered when the socket is used to read/write data

Change-Id: If6c0cd481bfd8e00b57a30c4fb6d350756bff951

src/jamidht/multiplexed_socket.cpp

@@ -597,11 +597,8 @@ ChannelSocket::read(ValueType* buf, std::size_t len, std::error_code& ec)
 {
     if (auto ep = pimpl_->endpoint.lock()) {
         int res = ep->read(pimpl_->channel, buf, len, ec);
-        if (res < 0) {
         if (ec)
             JAMI_ERR("Error when reading on channel: %s", ec.message().c_str());
-            shutdown();
-        }
         return res;
     }
     ec = std::make_error_code(std::errc::broken_pipe);
@@ -613,11 +610,8 @@ ChannelSocket::write(const ValueType* buf, std::size_t len, std::error_code& ec)
 {
     if (auto ep = pimpl_->endpoint.lock()) {
         int res = ep->write(pimpl_->channel, buf, len, ec);
-        if (res < 0) {
         if (ec)
             JAMI_ERR("Error when writing on channel: %s", ec.message().c_str());
-            shutdown();
-        }
         return res;
     }
     ec = std::make_error_code(std::errc::broken_pipe);
@@ -629,10 +623,8 @@ ChannelSocket::waitForData(std::chrono::milliseconds timeout, std::error_code& e
 {
     if (auto ep = pimpl_->endpoint.lock()) {
         auto res = ep->waitForData(pimpl_->channel, timeout, ec);
-        if (res < 0) {
         if (ec)
             JAMI_ERR("Error when waiting on channel: %s", ec.message().c_str());
-        }
         return res;
     }
     ec = std::make_error_code(std::errc::broken_pipe);