[Dovecot] bug with null pointer

[Tobias Daucher]

Hi,
we found a serious bug while testing our migration scripts.
in Solaris (or other system 5) the user variable is not always set.
Dsync is not very happy about that and crashes with an segmentation fault.
After hours of debugging and TWOE simple lines
# USER=$LOGNAME
# export USER
the problem was solved! The null pointer was found - so i will go home now an
drink a bottle of "Erdinger"...
hope this hint helps for development - and we hope that we don't find
more of these bugs :)
bye
Tobi

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