When trying out the pdb_pgsql passdb backend we found some problems which made 
it unusable. There was a case where there were no SID's in the database. The 
code checks for the absense of these, but afterwards it still sets the 
(uninitialized variables) in the session. This causes 'pdbedit -L' to crash 
since the sid to text translator probably walks out of the buffer.
Anyways, it was fixed and later verified agains the pdb_mysql which does 
exactly the same as our initial fix.

This patch also fixes a small bug in a debug print, which uses '%llu' to print 
the number of rows, which in reality is a 'int' in the postgresql interface. So 
it is fixed to '%d', no crashes here, just more sane debugging.