security: Fix comment of security_key_permission

Comment for return value of security_key_permission() has been wrong
since it was added in 2.6.15.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/include/linux/security.h b/include/linux/security.h
index fd4d55f..e7d89b0 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1058,8 +1058,7 @@
  *	@cred points to the credentials to provide the context against which to
  *	evaluate the security data on the key.
  *	@perm describes the combination of permissions required of this key.
- *	Return 1 if permission granted, 0 if permission denied and -ve it the
- *	normal permissions model should be effected.
+ *	Return 0 if permission is granted, -ve error otherwise.
  * @key_getsecurity:
  *	Get a textual representation of the security context attached to a key
  *	for the purposes of honouring KEYCTL_GETSECURITY.  This function