Simplify serial correlation functions.
Simplify serial correlation functions.

By initialising scclast with 0 we don't need to use first_byte variable.

wxsBSD/yara,foreni-packages/yara,plusvic/yara,tanium/yara,bmagistro/yara,jshufelt/yara,neatsun/yara,pombredanne/yara,tdr130/yara,beikezcs/yara,rednaga/yara,kallanreed/yara,tdr130/yara,hillu/yara,hillu/yara,wxsBSD/yara,msuvajac/yara,plusvic/yara,pombredanne/yara,foreni-packages/yara,VirusTotal/yara,MeteorAdminz/yara,frbapolkosnik/yara,msuvajac/yara,jshufelt/yara,digideskio/yara,Security513/yara,foreni-packages/yara,jpypi/yara,plusvic/yara,digideskio/yara,bmagistro/yara,mgoffin/yara,neatsun/yara,neatsun/yara,frbapolkosnik/yara,smaudet/yara,smaudet/yara,cblichmann/yara,VirusTotal/yara,smaudet/yara,digideskio/yara,Security513/yara,Security513/yara,wxsBSD/yara,hillu/yara,wxsBSD/yara,beikezcs/yara,rednaga/yara,beikezcs/yara,msuvajac/yara,smaudet/yara,tdr130/yara,frbapolkosnik/yara,cblichmann/yara,mgoffin/yara,rayyang2000/yara,jpypi/yara,cblichmann/yara,wxsBSD/yara,jshufelt/yara,VirusTotal/yara,bmagistro/yara,VirusTotal/yara,pombredanne/yara,hillu/yara,MeteorAdminz/yara,tanium/yara,rayyang2000/yara,kallanreed/yara,frbapolkosnik/yara,MeteorAdminz/yara,rednaga/yara,rayyang2000/yara,mgoffin/yara,plusvic/yara,tanium/yara,jpypi/yara,cblichmann/yara,VirusTotal/yara,digideskio/yara,mgoffin/yara,hillu/yara,jshufelt/yara,plusvic/yara,pombredanne/yara,cblichmann/yara,pombredanne/yara,kallanreed/yara