Fix segfault when yr_finalize is invoked without calling yr_initialize first
Fix segfault when yr_finalize is invoked without calling yr_initialize first

kallanreed/yara,hillu/yara,plusvic/yara,MeteorAdminz/yara,rednaga/yara,rednaga/yara,cblichmann/yara,wxsBSD/yara,wxsBSD/yara,tanium/yara,cblichmann/yara,wxsBSD/yara,hillu/yara,jpypi/yara,kallanreed/yara,pombredanne/yara,bmagistro/yara,pombredanne/yara,hillu/yara,pombredanne/yara,VirusTotal/yara,kallanreed/yara,tanium/yara,cblichmann/yara,jpypi/yara,wxsBSD/yara,VirusTotal/yara,VirusTotal/yara,pombredanne/yara,hillu/yara,plusvic/yara,plusvic/yara,plusvic/yara,bmagistro/yara,VirusTotal/yara,msuvajac/yara,VirusTotal/yara,msuvajac/yara,MeteorAdminz/yara,cblichmann/yara,pombredanne/yara,MeteorAdminz/yara,tanium/yara,bmagistro/yara,wxsBSD/yara,jpypi/yara,plusvic/yara,msuvajac/yara,hillu/yara,rednaga/yara,cblichmann/yara