It is not necessary to check if value != NULL before calling
'parse_lldiff_command' as there is already a check inside this
function.
By the way this patch also improves the existing check inside
'parse_lldiff_command' by using:
return config_error_nonbool(var);
instead of:
return error("%s: lacks value", var);
Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>