[Dovecot] 1.0-test49 FD leak

[Gregory Bond]

I'm running 1.0-test49 on Solaris 2.8.

The good news is that this version fixes my problem with corrupted index 
files (so far).

The bad news is it seems to be leaking FDs to do with inbox:

imap    10198  gnb  156r  VDIR      255,7032     8192 5784160 
/home/gnb/Maildir/new
imap    10198  gnb  157r  VDIR      255,7032  1093632 2917923 
/home/gnb/Maildir/cur
imap    10198  gnb  158r  VDIR      255,7032     8192 5784160 
/home/gnb/Maildir/new
imap    10198  gnb  159r  VDIR      255,7032  1093632 2917923 
/home/gnb/Maildir/cur
imap    10198  gnb  160r  VDIR      255,7032     8192 5784160 
/home/gnb/Maildir/new
imap    10198  gnb  161r  VDIR      255,7032  1093632 2917923 
/home/gnb/Maildir/cur
imap    10198  gnb  162r  VDIR      255,7032     8192 5784160 
/home/gnb/Maildir/new
imap    10198  gnb  163r  VDIR      255,7032  1093632 2917923 
/home/gnb/Maildir/cur
imap    10198  gnb  164r  VDIR      255,7032     8192 5784160 
/home/gnb/Maildir/new
imap    10198  gnb  165r  VDIR      255,7032  1093632 2917923 
/home/gnb/Maildir/cur

(seems to be a new pair of FDs leaked each time my MUA checks for new mail).