segfaults with 2.1.11

[Andreas Hasenack]

After upgrading to 2.1.11 this morning I started to get random segfaults when
switching mailboxes (closing one and opening the other):

#0  index_fetchreply (mailbox=0x8130f80, msgno=28, rock=0xbfffc410) at index.c:2371
#1  0x080600ad in index_forsequence (mailbox=0x8130f80, sequence=0x81450d5 "", usinguid=0, proc=0x80632e0 <index_fetchreply>,
    rock=0xbfffc410, fetchedsomething=0xbfffc390) at index.c:1524
#2  0x080514a0 in cmd_fetch (tag=0x8144fa0 "a0008", sequence=0x2ad0fcb0 <Address 0x2ad0fcb0 out of bounds>, usinguid=0) at imapd.c:3092
#3  0x0805cf06 in cmdloop () at imapd.c:1081
#4  0x0805f69b in service_main (argc=1, argv=0x813b008, envp=0xbfffec0c) at imapd.c:689
#5  0x0804c8f7 in main (argc=1, argv=0x5c93f, envp=0xbfffec0c) at service.c:530

I'm using GSSAPI over TLS and mutt as a client.

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