[syslinux:master] altmbr: actually invoke the correct partition

[syslinux-bot for H. Peter Anvin]

Commit-ID:  794ff174175734a0974e1846f0db29040b096e45
Gitweb:     http://www.syslinux.org/commit/794ff174175734a0974e1846f0db29040b096e45
Author:     H. Peter Anvin <hpa at zytor.com>
AuthorDate: Wed, 21 Mar 2012 15:56:02 -0700
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Wed, 21 Mar 2012 15:56:02 -0700

altmbr: actually invoke the correct partition

We would fail to correctly invoke primary partitions 2-4 because of a
register usage bug.

Reported-by: Maxim Kammerer <mk at dee.su>
Signed-off-by: H. Peter Anvin <hpa at zytor.com>

---
 mbr/altmbr.S |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mbr/altmbr.S b/mbr/altmbr.S
index 1b60905..c66b4dd 100644
--- a/mbr/altmbr.S
+++ b/mbr/altmbr.S
@@ -204,7 +204,7 @@ scan_partition_table:
 5:
 	decb	(partition)
 	jz	boot
-	addw	$16, %bx
+	addw	$16, %si
 	loopw	5b
 
 	popw	%cx			/* %cx <- 4    */