Eliminate redundant buf validation checks in xxstrategy() methods now

that they're implemented consistently in bounds_check_with_label().

Also, per krw's request, change bounds_check_with_label() to return 0
if the checks succeed, and change the drivers to test == -1 instead of
<= 0.  (Man page update to follow; intentionally omitting
arch/vax/mba/hp.c from this commit because it doesn't even build
currently and miod@ promises to kill it soon.)

ok krw@

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