gas pressures: do some initial cleanup

This marks "surface_volume_multiplier()" static in preparation for
changing it to use an actual honest-to-goodness compressibility
estimation.  Without that, it wasn't obvious that the function wasn't
used in other random places.

Also, remove the "wet_volume()" function.  It was unused, but more
importantly, it was wrong.  Yes, it was the inverse of "gas_volume()",
but when you calculate wet volumes from the imperial sizes, you don't
actually use the "real" gas volume, you use the idealized one.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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