fix clang -Wtautological-compare with unsigned enum
Create a GREP_HEADER_FIELD_MIN so we can check that the field value is sane and silence the clang warning. Clang warning happens because the enum is unsigned (this is implementation-defined, and there is no negative fields) and the check is then tautological. Signed-off-by: NAntoine Pelisse <apelisse@gmail.com> Signed-off-by: NJohn Keeping <john@keeping.me.uk> Reviewed-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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