Fix read heap buffer overflow in PE module.
Fix read heap buffer overflow in PE module.

Credit to OSS-Fuzz for finding this bug.

hillu/yara,cblichmann/yara,pombredanne/yara,pombredanne/yara,hillu/yara,plusvic/yara,cblichmann/yara,tanium/yara,VirusTotal/yara,wxsBSD/yara,cblichmann/yara,pombredanne/yara,tanium/yara,cblichmann/yara,hillu/yara,plusvic/yara,VirusTotal/yara,VirusTotal/yara,wxsBSD/yara,plusvic/yara,hillu/yara,rednaga/yara,tanium/yara,cblichmann/yara,pombredanne/yara,wxsBSD/yara,VirusTotal/yara,rednaga/yara,plusvic/yara,pombredanne/yara,rednaga/yara,wxsBSD/yara,plusvic/yara,hillu/yara,wxsBSD/yara,VirusTotal/yara