autotest: wifi: fix syntax error

Fix syntax errors in 060Perf24HT20_TKIP.

BUG=none
TEST=really run all the tests

Change-Id: I9471ef3bf3124e82c077583b23790a5c46f1f02f
Reviewed-on: https://gerrit.chromium.org/gerrit/11269
Tested-by: Sam Leffler <sleffler@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Ready: Sam Leffler <sleffler@chromium.org>
1 file changed