altmbr: cap at 439 bytes so the partition select byte follows

Cap altmbr at 439 bytes, so that the partition select byte is not part
of the file.  This means that:

a) updating the altmbr doesn't clobber the configuration;
b) it is easier to simply concatenate the select byte to the file.

This also matches gptmbr behavior.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/mbr/checksize.pl b/mbr/checksize.pl
index 7d61bdfd..c1984dbf 100755
--- a/mbr/checksize.pl
+++ b/mbr/checksize.pl
@@ -30,7 +30,7 @@ if (!defined($maxsize)) {
     } elsif ($file =~ /^isohdp[fp]x[^0-9a-z]/) {
 	$maxsize = $padsize = 432;
     } elsif ($file =~ /^altmbr[^0-9a-z]/) {
-	$maxsize = 439; $padsize = 440;
+	$maxsize = $padsize = 439;
     } else {
 	die "$0: no default size for filename: $file\n";
     }