[Mimedefang] Checking error returned by clamav av

[Tomas Kopal]

Hi there,
I just recently upgraded mimedefang and I have run into problems, after 
few hours of work identified as wrong permisions on files passed for 
scanning.
But during the troubleshooting, I noticed that currently there is no 
checking for error returned by clamd in message_contains_virus_clamd 
function, only in entity_contains_virus_clamd. And even that one is not 
giving much information, just reports failure.

The attached patch adds more error reporting for easier diagnoists. Hope 
you find it useful.

Thanks

Tomas

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