[Mutt] #3068: mutt -d 5 may crash

[Mutt <fleas@xxxxxxxx>]

#3068: mutt -d 5 may crash

 Hi,

 If you look into mutt_addr_is_user, you will see twice dprint(5,
 "...%s\n", .... mutt_fqdn(X)); And mutt_fqdn may return NULL. I'm
 attaching diff which fixed this issue for me.

 Thank you

 --
   Vlad

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Ticket URL: <http://dev.mutt.org/trac/ticket/3068>