(ITS#5961) segfault if shm isn't available

Full_Name: Quanah Gibson-Mount Version: RE24/HEAD OS: Linux 2.6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (75.111.29.239)

If OpenLDAP can't join the shm environment due to size issues, it segfaults:

#0 0x0000002a973fe32b in hdb_checkpoint (ctx=0x41000e20, arg=0x999820) at config.c:192 192 config.c: No such file or directory. in config.c (gdb) bt #0 0x0000002a973fe32b in hdb_checkpoint (ctx=0x41000e20, arg=0x999820) at config.c:192 #1 0x0000002a95702a60 in ldap_int_thread_pool_wrapper (xpool=0x916ee0) at tpool.c:663 #2 0x0000003bfa006137 in start_thread () from /lib64/tls/libpthread.so.0 #3 0x0000003bf97c7533 in clone () from /lib64/tls/libc.so.6