net/9p: Handle the server returned error properly

We need to get the negative errno value in the kernel
even for dotl.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/net/9p/client.c b/net/9p/client.c
index a803574..4ff068e 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -460,7 +460,8 @@
 			return err;
 		}
 
-		if (p9_is_proto_dotu(c))
+		if (p9_is_proto_dotu(c) ||
+			p9_is_proto_dotl(c))
 			err = -ecode;
 
 		if (!err || !IS_ERR_VALUE(err))