Fix test on invalid null will topic value in connect packet

Signed-off-by: Jerome Malinge <[email protected]>

test/broker/07-will-null-topic.py

@@ -3,6 +3,8 @@
 import struct
 
 from mosq_test_helper import *
+from socket import error as SocketError
+import errno
 
 rc = 1
 keepalive = 60
@@ -16,6 +18,11 @@
  sock = mosq_test.do_client_connect(connect_packet, b"", timeout=30, port=port)
  rc = 0
  sock.close()
+except SocketError as e:
+ if e.errno == errno.ECONNRESET:
+ # Connection has been closed by peer (very quickly).
+ # Fine, this is the expected behavior.
+ rc = 0
 finally:
  broker.terminate()
  broker.wait()