Don't ELOG ipc EOF

Receiving EOF from a client is not an error, but rather a standard way a
client may disconnect from the IPC. This should rather be logged from
a consumer of the libi3 ipc_recv_message() function as a normal client
disconnect event.

fixes #1252

libi3/ipc_recv_message.c

@@ -41,7 +41,6 @@ int ipc_recv_message(int sockfd, uint32_t *message_type,
         if (n == -1)
             return -1;
         if (n == 0) {
-            ELOG("IPC: received EOF instead of reply\n");
             return -2;
         }