disk_1308 nlc-- double decrement 0->ff fix

[User65-87-11]

when running QEMU and requesting geometry with CYL=1 it would return 0xff instead of 0.
BOCHS returns 0 as expected.
I have put [if] in case it is something important to have at least a zero check condition. But is it that important to have "1 reserverd" in an emulator?

Running bochs:

ata0-master: type=disk, path="\wsl.localhost\Debian\home\user\devel\os64\build\boot.img", cylinders=1, heads=1, spt=26
boot: disk

Running qemu:
qemu-system-x86_64.exe -device ide-hd,bus=ide.0,drive=disk0,cyls=1,heads=1,secs=26,bios-chs-trans=none -drive if=none,format=raw,id=disk0,file=\wsl.localhost\Debian\home\user\devel\os64\build\boot.img

disk_1308(struct bregs *regs, struct drive_s *drive_fl)
{

else if (regs->dl < EXTSTART_CD) {
        // Hard drive
        count = GET_BDA(hdcount);
        
		//is [nlc--] actually needed in an emulator?
		//when emulated CYL=1 Hard drive then double decrement causes ff to be returned by int 13h ah=08h
			
		// if(nlc > 0) 
        	// nlc--;  
		
    }