fix some bugs in the linux boot code.

grub/asmstub.c

@@ -66,6 +66,7 @@ unsigned long install_partition = 0x20000;
 unsigned long boot_drive = 0;
 char version_string[] = VERSION;
 char config_file[128] = "/boot/grub/menu.lst"; /* FIXME: arbitrary */
+unsigned long linux_text_len = 0;
 
 /* Emulation requirements. */
 char *grub_scratch_mem = 0;