userns: On alpha modify linux_to_osf_stat to use convert from kuids and kgids

Silencing build errors and potentially allowing people to use osf
system calls in from processes running in a non-default user namespace.

It seems this stat call was missed in my first round of converting the
stat system calls, bother.

Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

arch/alpha/kernel/osf_sys.c

@@ -278,8 +278,8 @@ linux_to_osf_stat(struct kstat *lstat, struct osf_stat __user *osf_stat)
 	tmp.st_dev	= lstat->dev;
 	tmp.st_mode	= lstat->mode;
 	tmp.st_nlink	= lstat->nlink;
-	tmp.st_uid	= lstat->uid;
-	tmp.st_gid	= lstat->gid;
+	tmp.st_uid	= from_kuid_munged(current_user_ns(), lstat->uid);
+	tmp.st_gid	= from_kgid_munged(current_user_ns(), lstat->gid);
 	tmp.st_rdev	= lstat->rdev;
 	tmp.st_ldev	= lstat->rdev;
 	tmp.st_size	= lstat->size;