Bug #26704451: INCORRECT BEHAVIOR WITH USE OF CERTAIN

               CHARSETS AND SHA2

Missed pushing to 5.5.

sql/item_strfunc.cc

@@ -266,9 +266,9 @@ String *Item_func_sha2::val_str_ascii(String *str)
   size_t input_len;
   uint digest_length= 0;
 
+  input_string= args[0]->val_str(str);
   str->set_charset(&my_charset_bin);
 
-  input_string= args[0]->val_str(str);
   if (input_string == NULL)
   {
     null_value= TRUE;