9p: Modify struct 9p_fid to use a kuid_t not a uid_t

Change struct 9p_fid and it's associated functions to
use kuid_t's instead of uid_t.

Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 6b031ab..5ff70f4 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -187,7 +187,7 @@
 	int mode;
 	struct p9_qid qid;
 	u32 iounit;
-	uid_t uid;
+	kuid_t uid;
 
 	void *rdir;