Relax the rule against declaring variables in nested scopes and for initializations.
Relax some overly perscriptive rules against declarations: they may be at the start of any blocks, even if things aren't super complicated. Allow more initializations (those that call simple functions, like accessor functions for newbus are fine). Allow the common idiom of declaring the loop variable in a for loop.
This tries to codify what common exceptions are today, as well as give some guidance on when it's best to do these things.
vfs: fix vn_poll performance with either MAC or AUDIT
The code would unconditionally lock the vnode to audit or call the mac hoook, even if neither want to do anything. Pre-check the state to avoid locking in the common case of nothing to do.
Note this code should not be normally executed anyway as vnodes are always return ready. However, poll1/2 from will-it-scale use regular files for benchmarking, presumably to focus on the interface itself as the vnode handler is not supposed to do almost anything.
This in particular fixes poll2 which passes 128 fds.
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