With -Werror=ignored-qualifiers, a function that claims to return
"const char" gets this error:
CC sequencer.o
sequencer.c:798:19: error: type qualifiers ignored on function return
type [-Werror=ignored-qualifiers]
static const char command_to_char(const enum todo_command command)
^
Reported-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>