An after-fix for

Bug#11765108 - Bug#58036: CLIENT UTF32, UTF16, UCS2 SHOULD BE DISALLOWED, THEY CRASH SERVER 

Fixing wrong usage of DBUG_ASSERT.
In non-debug version thd_init_client_charset
was not executed at all.

sql/sql_parse.cc

@@ -1218,7 +1218,8 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
           We have checked charset earlier,
           so thd_init_client_charset cannot fail.
         */
-        DBUG_ASSERT(!thd_init_client_charset(thd, cs_number));
+        if (thd_init_client_charset(thd, cs_number))
+          DBUG_ASSERT(0);
         thd->update_charset();
       }
     }