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(ITS#4904) delta-sync can free modlist redundantly

Full_Name: Howard Chu
Version: 2.3/HEAD
OS: 
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (76.168.84.21)
Submitted by: hyc


In syncrepl_message_to_op the modlist is copied to op->orm_modlist and then
freed after op->o_bd->be_modify. But the modify can alter the modlist (e.g.,
ppolicy overlay) causing a redundant free later on.