altos: Make sure pa to altitude conversion is done with 32 bits
authorKeith Packard <keithp@keithp.com>
Mon, 10 Dec 2012 02:27:49 +0000 (18:27 -0800)
committerKeith Packard <keithp@keithp.com>
Mon, 10 Dec 2012 02:27:49 +0000 (18:27 -0800)
We need 32 bits to hold intermediate values, even if the final
altitude is reported in only 16 bits.

Signed-off-by: Keith Packard <keithp@keithp.com>

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