fix for the issue #341 #347
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The problem is described at #341. Scan of port 3490 from a Linux machine by
'nmap -v -p 3490 -Pn IP_address_of_QNX_board' leads to dlt-daemon crash.
The solution:
It is necessary to parse the code of the returned error in errno. If errno = ECONNABORTED it means there was an attempt to scan port 3490 and on this error there is no need to exit the application by error.