Fix PDF double-free bug (#1559) #2919

Job	Run time
check (clamd)	13s
check (clambc)	11s
check (libclamav, (iana_cctld\|bytecode_api_\|bytecode_hooks\|rijndael\|yara\|inffixed\|inflate\|queue\|n...	15s
check (libfreshclam)	11s
check (freshclam)	10s
check (clamscan)	16s
check (examples)	15s
check (clamonacc, (c-thread-pool\|fts\|priv_fts))	15s
check (clamconf)	11s
check (clamsubmit)	12s
check (libfreshclam)	11s
check (clamdscan)	11s
check (sigtool)	13s
check (clamav-milter)	12s
check (clamdtop)	11s
check (common)	14s
check (win32/compat)	14s
	3m 35s

Provide feedback