Revert "UBUNTU: SAUCE: apparmor: Don't audit denied access of special apparmor .null file"

This reverts commit 38567b0e.

BugLink: https://bugs.launchpad.net/bugs/1666897Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

security/apparmor/lsm.c

@@ -443,9 +443,6 @@ static int common_file_perm(const char *op, struct file *file, u32 mask)
 	struct aa_label *label;
 	int error = 0;
 
-	if (file->f_path.dentry == aa_null.dentry)
-		return -EACCES;
-
 	label = aa_begin_current_label(NO_UPDATE);
 	error = aa_file_perm(op, label, file, mask);
 	aa_end_current_label(label);