Portability fixes

Fixes while reviewing new pushed code
NULL as argument to encrypt/decrypt should return NULL without a warning

sql/sql_parse.cc

@@ -2897,6 +2897,7 @@ unsent_create_error:
     }
     else
       res= -1;
+    first_local_table->next= tables;
     lex->select_lex.table_list.first= (byte*) first_local_table;
     break;
   }