libselinux/utils: add noreturn attribute to selinux_check_access's usage

When building libselinux, clang reports the following warning:

    selinux_check_access.c:8:1: error: function 'usage' could be
    declared with attribute 'noreturn' [-Werror,-Wmissing-noreturn]

While at it, make progname const.

Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
1 file changed