`mount -a` segfaults when 4th field is omitted (mount options)

[Mike Frysinger <vapier@xxxxxxxxxx>]

with util-linux-2.19.1, `mount -a` segfaults easily:
# echo 'tmpd /tmp/x tmpfs' >> /etc/fstab
# mkdir /tmp/x
# mount -a
segfault

simple back trace:
(gdb) bt
#0  __strstr_sse2 (haystack_start=0x0, needle_start=0x42a060 "loop=") at 
../string/strstr.c:63
#1  0x00000000004068ba in is_fstab_entry_mounted (mc=0x63d5c0, verbose=0x0) at 
mount.c:2054
#2  0x0000000000406b8d in do_mount_all (types=0x0, options=0x0, test_opts=0x0) 
at mount.c:2126
#3  0x000000000040788f in main (argc=0x0, argv=0x7fffffffd208) at mount.c:2600
-mike

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