Fix building without SELINUX

since the scon is now a mandatory arg, it needs to exist even if
NULL

Change-Id: I8ba31a7a8cf357e9b0c43cee81ab49d3eb192819
toolbox: silence some compiler warnings

Comparison of signed and unsigned integers. Use parenthesis around a
group of bitwise OR operations.

Change-Id: Ia404380593ce2c2a291133c07c0fc7a016a3ad3f
Fix mode on /data/security.

Signed-off-by: ayysir <dresadd09691@gmail.com>