Bug#21215 mysqldump creating incomplete backups without warning

- Add call to 'safe_exit' function when db query fails.


client/mysqldump.c:
  Add a call to 'safe_exit' to remember the error code and exit unless --force was give.n
mysql-test/r/mysqldump.result:
  Add test result
mysql-test/t/mysqldump.test:
  Add test case

client/mysqldump.c

@@ -872,6 +872,7 @@ static int mysql_query_with_error_report(MYSQL *mysql_con, MYSQL_RES **res,
   {
     my_printf_error(0, "Couldn't execute '%s': %s (%d)", MYF(0),
                     query, mysql_error(mysql_con), mysql_errno(mysql_con));
+    safe_exit(EX_MYSQLERR);
     return 1;
   }
   return 0;