misc: fix valgrind warning (jump based on potential uninitialized values)

Change-Id: I0207e05d9cc39004465a5d273c4321b8d631ee4a

src/media/socket_pair.h

@@ -216,8 +216,8 @@ class SocketPair {
         static constexpr unsigned MAX_LIST_SIZE {10};
 
         mutable std::atomic_bool rtcpPacketLoss_ {false};
-        double lastSRTS_;
-        uint32_t lastDLSR_;
+        double lastSRTS_ {};
+        uint32_t lastDLSR_ {};
 
         std::list<double> histoLatency_;