and BUG#336: Subselects with tables does not work as values for
local SP variables (which was closed before with a temp. fix, but not
actually fixed).


mysql-test/r/sp-error.result:
  Moved test case for BUG#336 to sp.test, as it's not generating an error any longer.
mysql-test/r/sp.result:
  Move test case for BUG#336 from sp-error.test and added new test case
  for BUG#3157.
mysql-test/t/sp-error.test:
  Moved test case for BUG#336 to sp.test, as it's not generating an error any longer.
mysql-test/t/sp.test:
  Move test case for BUG#336 from sp-error.test and added new test case
  for BUG#3157.
sql/sp_head.cc:
  Open and close tables in set, jump-if[-not] and freturn instructions if
  the value expression is a subselect.
sql/sp_head.h:
  Store tables in set, jump-if[-not] and freturn instructions if
  the value expression is a subselect.
sql/sql_yacc.yy:
  Store tables in set, jump-if[-not] and freturn instructions if
  the value expression is a subselect.