net/9p: fid->fid is used uninitialized

Signed-off-by: Roel Kluin <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/9p/client.c

···
 		return ERR_PTR(-ENOMEM);
 
 	ret = p9_idpool_get(clnt->fidpool);
-	if (fid->fid < 0) {
+	if (ret < 0) {
 		ret = -ENOSPC;
 		goto error;
 	}