Follow up for CONC-622 test:

Host 0.0.0.0 is mapped to locahost, so we need another invalid
host address (1.0.0.0) instead and reduce the number of loops.

unittest/libmariadb/async.c

@@ -255,11 +255,12 @@ static int test_conc622(MYSQL *my __attribute__((unused)))
   int status;
   uint default_timeout;
   int i;
+  const char *invalid_host= "1.0.0.0";
 
   if (skip_async)
     return SKIP;
 
-  for (i=0; i < 100; i++)
+  for (i=0; i < 5; i++)
   {
     mysql_init(&mysql);
     rc= mysql_options(&mysql, MYSQL_OPT_NONBLOCK, 0);
@@ -273,7 +274,7 @@ static int test_conc622(MYSQL *my __attribute__((unused)))
     mysql_options(&mysql, MYSQL_READ_DEFAULT_GROUP, "myapp");
 
     /* Returns 0 when done, else flag for what to wait for when need to block. */
-    status= mysql_real_connect_start(&ret, &mysql, "0.0.0.0", username, password, schema, port, socketname, 0);
+    status= mysql_real_connect_start(&ret, &mysql, invalid_host, username, password, schema, port, socketname, 0);
     while (status)
     {
       status= wait_for_mysql(&mysql, status);
@@ -288,7 +289,8 @@ static int test_conc622(MYSQL *my __attribute__((unused)))
         status= mysql_close_cont(&mysql, status);
       }
     } else {
-      diag("Expected error when connection to host '0.0.0.0'");
+      diag("Expected error when connecting to host '%s'", invalid_host);
+      diag("Connected to %s", mysql_get_server_info(&mysql));
       return FAIL;
     }
   }