MFC: 1.208 In devfs_first(), set mp->mnt_opt to a valid empty list of mount options instead of leaving it NULL.  This eliminates a kernel panic when trying to do a mount -o update of /dev.
MFC: 1.208
In devfs_first(), set mp->mnt_opt to a valid empty list of mount options
instead of leaving it NULL.  This eliminates a kernel panic
when trying to do a mount -o update of /dev.

Noticed by:	cjsp
Reviewed by:	phk

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