rust_uprev: mark test_success_with_template mock_find_ebuild unused

Pre-submit checks complained that the mock_find_ebuild parameter to
test_success_with_template is unused. This change avoids the warning
by prefixing the paramter name with an underscore to indicate that
it is unused.

BUG=None
TEST=python3 ./rust_tools/rust_uprev_test.py

Change-Id: Ieadd3854970a1662a74159fd9e492d6ee2f5f963
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2593513
Tested-by: Bob Haarman <inglorion@chromium.org>
Reviewed-by: Tiancong Wang <tcwang@google.com>
Commit-Queue: Bob Haarman <inglorion@chromium.org>
1 file changed