apparmor: fix error code to failure message mapping for name lookup

-ESTALE used to be incorrectly used to indicate a disconnected path, when
name lookup failed.  This was fixed in commit e1b0e444 to correctly return
-EACCESS, but the error to failure message mapping was not correctly updated
to reflect this change.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Steve Beattie <sbeattie@ubuntu.com>

security/apparmor/path.c

@@ -174,7 +174,7 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer,
 	if (info && error) {
 		if (error == -ENOENT)
 			*info = "Failed name lookup - deleted entry";
-		else if (error == -ESTALE)
+		else if (error == -EACCES)
 			*info = "Failed name lookup - disconnected path";
 		else if (error == -ENAMETOOLONG)
 			*info = "Failed name lookup - name too long";