remove a redundant semicolon

src/test/test_dos.c

@@ -78,7 +78,7 @@ static int
 mock_channel_get_addr_if_possible(channel_t *chan, tor_addr_t *addr_out)
 {
   (void)chan;
-  tt_int_op(AF_INET,OP_EQ, tor_addr_parse(addr_out, "18.0.0.1"));;
+  tt_int_op(AF_INET,OP_EQ, tor_addr_parse(addr_out, "18.0.0.1"));
   return 1;
 
  done: