Konstantin Belousov a1a917e029 User may do "mount -o snapshot ...", that causes new FFS mount to be
performed with snapshot option, while the mp->mnt_opt is NULL.
Protect against NULL pointer dereference.

Noted by:	Mateusz Guzik <mjguzik gmail com>
MFC after:	3 days
2008-08-06 14:47:19 +00:00
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