[roll pigweed] pw_unit_test: Add missing return type annotations to EventHandler

The EventHandler abstract class (and LoggingEventHandler, derived from
it) was missing return-type annotations for each of its methods.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/103763

https://pigweed.googlesource.com/pigweed/pigweed
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Change-Id: I4a4db4322f427476dba9569e3a44fadf1be406ec
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/103823
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1 file changed
tree: 1967504875ff2d9cc5a980120a5a721fedb2fe46
  1. .gitmodules
  2. test.sh