[LinuxBIOS] Fix to vga emulator (from MSI)

[ron minnich]

This change fixes a long-standing bug, whereby we do not set ret for an
un-inited vector, which we should have done.
Signed-off-by: Ronald G. Minnich

---

Index: devices/emulator/biosemu.c
===================================================================
--- devices/emulator/biosemu.c  (revision 2470)
+++ devices/emulator/biosemu.c  (working copy)
@@ -122,6 +122,7 @@
        case 0x6D:
                if (getIntVect(num) == 0x0000) {
                        printk_debug("un-inited int vector\n");
+                       ret = 1;
                }
                if (getIntVect(num) == 0xFF065) {
                        //ret = int42_handler();