Bug#19410 Test 'kill' fails on Windows + SCO

- Use "mysql_stmt_field_count" to determine if there is a need to
call "mysql_stmt_store_result"


client/mysqltest.c:
  Only call 'mysql_stmt_store_result' if 'mysql_stmt_field_count' is
  greater than 0 indicating that this query has a result set.
  This change is mainly since if mysql_stmt_store_result fails
  the value returned by mysql_stmt_field_count will be reset.

client/mysqltest.c

@@ -5048,8 +5048,9 @@ void run_query_stmt(MYSQL *mysql, struct st_command *command,
   /*
     If we got here the statement succeeded and was expected to do so,
     get data. Note that this can still give errors found during execution!
+    Store the result of the query if if will return any fields
   */
-  if (mysql_stmt_store_result(stmt))
+  if (mysql_stmt_field_count(stmt) && mysql_stmt_store_result(stmt))
   {
     handle_error(command, mysql_stmt_errno(stmt),
                  mysql_stmt_error(stmt), mysql_stmt_sqlstate(stmt), ds);