Fix for mysql_stmt_close(), so that the PHP layer can map it easily to know...

Fix for mysql_stmt_close(), so that the PHP layer can map it easily to know whether the 'stmt' is really freed, so that they can free their internal stmts

libmysql/libmysql.c

@@ -5430,12 +5430,15 @@ int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
 static my_bool stmt_close(MYSQL_STMT *stmt, my_bool skip_list)
 {
   MYSQL *mysql;
-  my_bool error= 0;
   DBUG_ENTER("mysql_stmt_close");
 
   DBUG_ASSERT(stmt != 0);
   
-  mysql= stmt->mysql;
+  if (!(mysql= stmt->mysql))
+  {
+    my_free((gptr) stmt, MYF(MY_WME));
+    DBUG_RETURN(0);
+  }
   if (mysql->status != MYSQL_STATUS_READY)
   {
     /* Clear the current execution status */
@@ -5454,18 +5457,20 @@ static my_bool stmt_close(MYSQL_STMT *stmt, my_bool skip_list)
   {
     char buff[4];
     int4store(buff, stmt->stmt_id);
-    error= simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1);
-  }
-  if (!error)
+    if (simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1))
     {
+      set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno);
+      stmt->mysql= NULL; /* connection isn't valid anymore */
+      DBUG_RETURN(1);
+    }
+  }
   mysql_free_result(stmt->result);
   free_root(&stmt->mem_root, MYF(0));
   if (!skip_list)
     mysql->stmts= list_delete(mysql->stmts, &stmt->list);
   mysql->status= MYSQL_STATUS_READY;
   my_free((gptr) stmt, MYF(MY_WME));
-  }
-  DBUG_RETURN(error);
+  DBUG_RETURN(0);
 }
 
 my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)