mysql_update(): Call handler::unlock_row()
  also in the first while loop.
  This patch is from Heikki,
  and it was approved by Sergei Golubchik.


sql/sql_update.cc:
  mysql_update(): Call handler::unlock_row()
  also in the first while loop.
  This patch is from Heikki,
  and it was approved by Sergei Golubchik.