rxrpc: Add missing unlock in rxrpc_call_accept()

Add a missing unlock in rxrpc_call_accept() in the path taken if there's no
call to wake up.

Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index b8acec0..06e328f 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -425,9 +425,11 @@
 
 	write_lock(&rx->call_lock);
 
-	ret = -ENODATA;
-	if (list_empty(&rx->to_be_accepted))
-		goto out;
+	if (list_empty(&rx->to_be_accepted)) {
+		write_unlock(&rx->call_lock);
+		kleave(" = -ENODATA [empty]");
+		return ERR_PTR(-ENODATA);
+	}
 
 	/* check the user ID isn't already in use */
 	pp = &rx->calls.rb_node;