Fix infinite loop

If a socket is deleted while packets are queued for fake lag for it.

P4:6722467

src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp

@@ -1163,8 +1163,8 @@ public:
 				{
 					ProcessPacket( pkt, usecNow );
 				}
-				m_list.RemoveFromHead();
 			}
+			m_list.RemoveFromHead();
 		}
 
 		Schedule();