tree 2264c00df6319ffbe2d9bc4aba896c9a3cc813dd
parent 2547c00e1d0c34dea7f80168f36f5ddc557b3b0d
author David Brown <david.brown@linaro.org> 1615378871 -0700
committer David Brown <davidb@davidb.org> 1615472743 -0700

sim: Use Option instead of Err<T, ()>

Instead of using an Err type with no meaningful error type, just use an
Option.

Signed-off-by: David Brown <david.brown@linaro.org>