PeerContext is used after being deleted, keep shared pointer to it. (#161)

Signed-off-by: Alexey-N-Chernyshov <alexey.n.chernyshov@gmail.com>

src/protocol/gossip/impl/connectivity.cpp

@@ -50,9 +50,9 @@ namespace libp2p::protocol::gossip {
     // clang-format off
     on_stream_event_ =
         [this, self_wptr=weak_from_this()]
-            (const PeerContextPtr &from, outcome::result<Success> event) {
+            (PeerContextPtr from, outcome::result<Success> event) {
           if (self_wptr.expired()) return;
-          onStreamEvent(from, event);
+          onStreamEvent(std::move(from), event);
         };
 
     host_->setProtocolHandler(

src/protocol/gossip/impl/stream.hpp

@@ -23,7 +23,7 @@ namespace libp2p::protocol::gossip {
   class Stream : public std::enable_shared_from_this<Stream> {
    public:
     /// Feedback interface to its owning object (i.e. pub-sub instance)
-    using Feedback = std::function<void(const PeerContextPtr &from,
+    using Feedback = std::function<void(PeerContextPtr from,
                                         outcome::result<Success> event)>;
 
     /// Ctor. N.B. Stream instance cannot live longer than its creators