Mark Johnston 243b324f96 devfs: Avoid comparison with an uninitialized var in devfs_fp_check()
devvn_refthread() will initialize *devp only if it succeeds, so check for
success before comparing with fp->f_data.  Other devvn_refthread()
callers are careful to do this.

Reported by:	KMSAN
Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D30068
2021-05-03 13:24:30 -04:00
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