Don't dec/inc the amountpipes counter every time we resize a pipe --

instead, just dec/inc in the ctor/dtor.  For now, increment/decrement
in two's, since we're now performing the operation once per pair,
not once per pipe.  Not really any measurable performance change
in my micro-benchmarks, but doing less work is good, especially when
it comes to atomic operations.

Suggested by:	alc

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