[PATCH] CLEANUP: fix a misspell in tests/filltab25.c

[Joseph Herlant]

Hi,

This is the only typo detected in the tests, so leaving it for a patch
of its own.

The patch is attached, but if you want to view the diff online, you
can check: https://github.com/haproxy/haproxy/compare/master...aerostitch:cleanup_tests_typo

Thanks for your help,
Joseph