net: flag relevant Sock methods with [[nodiscard]]

src/util/sock.cpp

@@ -179,7 +179,7 @@ void Sock::SendComplete(const std::string& data,
         // Wait for a short while (or the socket to become ready for sending) before retrying
         // if nothing was sent.
         const auto wait_time = std::min(deadline - now, std::chrono::milliseconds{MAX_WAIT_FOR_IO});
-        Wait(wait_time, SEND);
+        (void)Wait(wait_time, SEND);
     }
 }
 
@@ -262,7 +262,7 @@ std::string Sock::RecvUntilTerminator(uint8_t terminator,
 
         // Wait for a short while (or the socket to become ready for reading) before retrying.
         const auto wait_time = std::min(deadline - now, std::chrono::milliseconds{MAX_WAIT_FOR_IO});
-        Wait(wait_time, RECV);
+        (void)Wait(wait_time, RECV);
     }
 }