markj 204d7bf6cd Remove a use of a negative array index from fxp(4).
This fixes a warning seen when compiling amd64 GENERIC with clang 7.
Also remove the workaround added in r337324.  clang 7 and gcc 4.2
generate the same code with or without the code change.

Reviewed by:	imp (previous version)
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D18603
2018-12-19 04:54:32 +00:00
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