Aiieee. Add a missing underscore.

Change-Id: I38ebf3a6886bf8142836565652110f343a56877a
Reviewed-on: https://code-review.googlesource.com/c/re2/+/53872
Reviewed-by: Paul Wankadia <junyer@google.com>
(cherry picked from commit 209eda1b607909cf3c9ad084264039546155aeaa)
Reviewed-on: https://code-review.googlesource.com/c/re2/+/53873
1 file changed