asomers 4e5c8f88ee fusefs tests: quell Coverity "Argument cannot be negative" warnings
Must abort tests early if open(2) fails.

Reported by:	Coverity
Coverity CID:	1432810 and many others
Reviewed by:	kevans
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D26635
2020-10-02 17:06:05 +00:00
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