apparmor: Fix failure to audit context info in build_change_hat

Cleans up clang warning:
warning: variable 'info' set but not used [-Wunused-but-set-variable]

Fixes: 89dbf1962aa63 ("apparmor: move change_hat mediation to using labels")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
1 file changed