Stop assigning 0 to the extended_regexp_option field right after we've
zeroed out the entire struct with memset() just a few lines earlier.
Unlike some of the code being refactored in subsequent commits, this
was always completely redundant. See the original code introduced in 84befcd0a4 ("grep: add a grep.patternType configuration setting",
2012-08-03).
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>