Fix buffer overflow in module "macho".
Fix buffer overflow in module "macho".

cblichmann/yara,cblichmann/yara,hillu/yara,cblichmann/yara,wxsBSD/yara,VirusTotal/yara,wxsBSD/yara,VirusTotal/yara,cblichmann/yara,pombredanne/yara,wxsBSD/yara,wxsBSD/yara,wxsBSD/yara,pombredanne/yara,pombredanne/yara,VirusTotal/yara,pombredanne/yara,pombredanne/yara,hillu/yara,VirusTotal/yara,hillu/yara,hillu/yara,cblichmann/yara,VirusTotal/yara,hillu/yara