Ticket #48536 - Crash in slapi_get_object_extension
Description: commit 091a5f5daf3fa378f029e293c5358ae9be9f548e introduced
a compier warning: format '%x' expects argument of type 'unsigned int',
but argument 4 has type 'Slapi_PBlock * {aka struct slapi_pblock *}
Replacing '%x' with '%p'.