Fix buffer overflow in str_table_entry.
Fix buffer overflow in str_table_entry.

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