Mateusz Guzik 1874c61b90 vfs: restore mp null check in vop_stdgetwritemount
The initially read mount point can already be NULL.

Reported by:	markj
Fixes: r351656 ("vfs: stop refing freed mount points in vop_stdgetwritemount")
Sponsored by:	The FreeBSD Foundation
2019-09-02 15:24:25 +00:00
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