lib-master: ipc-client: Don't free command too early

When multiple replies were received by IPC only the final reply should free
the command. This may have caused e.g. "doveadm proxy list" to crash.
Broken by 435f054

src/lib-master/ipc-client.c

@@ -73,10 +73,10 @@ static void ipc_client_input_line(struct ipc_client *client, const char *line)
 		else
 			client->aborted_cmds_count--;
 	}
-	if (cmd != NULL) {
+	if (cmd != NULL)
 		cmd->callback(state, line, cmd->context);
+	if (state != IPC_CLIENT_CMD_STATE_REPLY)
 		i_free(cmd);
-	}
 	if (disconnect)
 		ipc_client_disconnect(client);
 }