SctpTransport::Instances was not being freed causing memory leak warnings

Author: les-sosna

src/impl/sctptransport.cpp

@@ -82,7 +82,7 @@ class SctpTransport::InstancesSet {
 	std::shared_mutex mMutex;
 };
 
-SctpTransport::InstancesSet *SctpTransport::Instances = new InstancesSet;
+std::unique_ptr<SctpTransport::InstancesSet> SctpTransport::Instances = std::make_unique<InstancesSet>();
 
 void SctpTransport::Init() {
 	usrsctp_init(0, SctpTransport::WriteCallback, SctpTransport::DebugCallback);

src/impl/sctptransport.hpp

@@ -127,7 +127,7 @@ class SctpTransport final : public Transport, public std::enable_shared_from_thi
 	static void DebugCallback(const char *format, ...);
 
 	class InstancesSet;
-	static InstancesSet *Instances;
+	static std::unique_ptr<InstancesSet> Instances;
 };
 
 } // namespace rtc::impl