Remove a redundant map access.

Change-Id: I37de97f08d37e4de0f413ef5248f9d55e2b168b3
Reviewed-on: https://code-review.googlesource.com/c/re2/+/59490
Reviewed-by: Matthew Fowles Kulukundis <kfm@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed