K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2019-12-11T15:52:29.763187Z
K 7
svn:log
V 255
add a sanity check to the system call registration code

A system call number should be at least reserved.
We do not expect an attempt to register a fixed number system call
when nothing at all is known about it.

MFC after:	3 weeks
Sponsored by:	Panzura

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