K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2019-04-06T18:04:04.037620Z
K 7
svn:log
V 354
fusefs: fix a panic on mount

Don't page fault if the file descriptor provided with "-o fd" is invalid.
This is a merge of r345419 from the projects/fuse2 branch.

Reviewed by:	ngie
Tested by:	Marek Zarychta <zarychtam@plan-b.pwste.edu.pl>
MFC after:	2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D19836

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