MBR: add HLT to prevent system from melting on failure

In case we hit the death loop, put HLT in it.  It's probably superfluous,
but it can't hurt, and we can always take it out to reclaim the space.

Arguable the death loop is superfluous at all, since int $0x18 should
never return.

1 files changed, 3 insertions, 1 deletions

diff --git a/mbr/mbr.S b/mbr/mbr.S
index 8d472da1..06e19805 100644
--- a/mbr/mbr.S
+++ b/mbr/mbr.S
@@ -285,7 +285,9 @@ error:
 	jmp	2b
 3:
 	int	$0x18		/* Boot failure */
-	jmp	.		/* Die */
+die:
+	hlt
+	jmp	die
 
 missing_os_msg:
 	.ascii	"Missing operating system.\r\n"