Ticket 47560: fixup memberof task does not work: task entry not added

Bug Description:

	The fixup memberof tasks is triggered by ADD of entry like:
	cn=memberOf_fixup_YYYY_MM_DD_HH_MM_SS, cn=memberOf task, cn=tasks, cn=config

	the script fixup-memberof.pl does not add this entry

Fix Description:
	Initialize the $entry variable

https://fedorahosted.org/389/ticket/47560

Reviewed by: Noriko Hosoi

Platforms tested: F17

Flag Day: no

Doc impact: no