Help freeloader stop crashing from divide-by-zero, provoked by drain-bamaged BIOS.

Modified: trunk/reactos/boot/freeldr/freeldr/arch/i386/pcdisk.c

--- trunk/reactos/boot/freeldr/freeldr/arch/i386/pcdisk.c	2005-01-27 15:28:08 UTC (rev 13338)
+++ trunk/reactos/boot/freeldr/freeldr/arch/i386/pcdisk.c	2005-01-27 21:12:05 UTC (rev 13339)
@@ -146,7 +146,9 @@

 	//
 	// Get the drive geometry
 	//

-	if (!MachDiskGetDriveGeometry(DriveNumber, &DriveGeometry))

+	if (!MachDiskGetDriveGeometry(DriveNumber, &DriveGeometry) ||
+	    DriveGeometry.Sectors == 0 ||
+	    DriveGeometry.Heads == 0)

 	{
 		return FALSE;
 	}