altos/attiny: Eliminate warnings from -Wconversion
authorKeith Packard <keithp@keithp.com>
Thu, 27 Jan 2022 23:52:44 +0000 (15:52 -0800)
committerKeith Packard <keithp@keithp.com>
Thu, 17 Feb 2022 01:26:49 +0000 (17:26 -0800)
These have no effect on the generated code as they simply make
implicit conversions explicit.

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

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