BUG#9814: post-review fixes: clear thd->net.no_send error after SP instruction

  execution, not before.

sql/sp_head.cc

@@ -642,13 +642,13 @@ sp_head::execute(THD *thd)
       items made during other permanent subquery transformations).
     */
     thd->current_arena= i;
+    ret= i->execute(thd, &ip);
     /*
-      no_send_error may have been set by the previous SP instruction when it
-      sent eof. Allow the current SP instruction to produce an error.
-      (multi-statement execution code clears no_send_error, too)
+      If this SP instruction have sent eof, it has caused no_send_error to be
+      set. Clear it back to allow the next instruction to send error. (multi-
+      statement execution code clears no_send_error between statements too)
     */
     thd->net.no_send_error= 0;
-    ret= i->execute(thd, &ip);
     if (i->free_list)
       cleanup_items(i->free_list);
     i->state= Query_arena::EXECUTED;