- Still one misssing zend_list_addref() and small fix in pg_close.

- Still one misssing zend_list_addref() and small fix in pg_close.
  Fixes #5349 (but not the way reporter wants...).

# There's something in the way database_connect/close functions behave when
# implemented the way as in mysql module that I find a bit strange... because
# of that extra zend_list_addref() there to prevent default link disappearing
# if it's not assigned to variable, when it is, I guess its' reference count
# is at this point 2, I can do: open a db link and assign it to a variable,
# close the link and still use it afterwards.