pressure interpolation: get rid of pointless and confusing code

In the function fill_missing_tank_pressures(), we only ever call
get_pr_interpolate_data() if "pressure" is zero.  So passing it in as an
argument, and then testing whether it is zero or not, is just totally
pointless, and only obfuscates things.

This whole thing seems to be due to people editing the code over time,
with the tests becoming superfluous as the code around it changed, and
nobody looking at whether it actually made sense any more.

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

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