weechat-matrix: Handle errors from the sso helper.

contrib/matrix_sso_helper

@@ -119,6 +119,7 @@ def main():
         return
 
     host, port = sock.getsockname()
+    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 
     message = {
         "type": "redirectUrl",

main.py

@@ -419,6 +419,9 @@ def sso_login_cb(server_name, command, return_code, out, err):
             token = ret["loginToken"]
             server.login(token=token)
 
+        elif msgtype == "error":
+            server.error("Error in the SSO helper {}".format(ret["message"]))
+
         else:
             server.error("Unknown SSO login message received from child "
                          "process.")