Unexpected message 'Error reading data from the connection' when fbtracemgr is closed using ctrl-C

[AlexPeshkoff]

Reported privately by artyom.abakumov artyom.abakumov@red-soft.ru

With the following command line:
./fbtracemgr -SE localhost:service_mgr -user SYSDBA -password masterkey -START -NAME my_trace -CONFIG trace.conf

And config:
database
{
enabled = true
format = 0
log_connections = true
time_threshold = 0
}

Unwanted message is always shown.