fs/9p: Initialize status in v9fs_file_do_lock.

If p9_client_lock_dotl returns an error, status is possibly never filled
but will be used in the following switch.
Initializing it to P9_LOCK_ERROR makes sur we will return an error and
cleanup (and not hit the default case).
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

fs/9p/vfs_file.c

@@ -149,7 +149,7 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
 {
 	struct p9_flock flock;
 	struct p9_fid *fid;
-	uint8_t status;
+	uint8_t status = P9_LOCK_ERROR;
 	int res = 0;
 	unsigned char fl_type;