userns: Properly print bluetooth socket uids

With user namespace support enabled building bluetooth generated the warning.
net/bluetooth/af_bluetooth.c: In function ‘bt_seq_show’:
net/bluetooth/af_bluetooth.c:598:7: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 7 has type ‘kuid_t’ [-Wformat]

Convert sock_i_uid from a kuid_t to a uid_t before printing, to avoid
this problem.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Masatake YAMATO <yamato@redhat.com>
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

net/bluetooth/af_bluetooth.c

@@ -591,7 +591,7 @@ static int bt_seq_show(struct seq_file *seq, void *v)
 			   atomic_read(&sk->sk_refcnt),
 			   sk_rmem_alloc_get(sk),
 			   sk_wmem_alloc_get(sk),
-			   sock_i_uid(sk),
+			   from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
 			   sock_i_ino(sk),
 			   &src_baswapped,
 			   &dst_baswapped,