ktest: Fail when grub menu not found

Currently if the grub menu that is supplied is not found, it will
just boot into the last grub menu in menu.lst. Fail instead of
confusing the user why their kernel is not booting.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

tools/testing/ktest/ktest.pl

@@ -862,9 +862,12 @@ sub get_grub_index {
     open(IN, "$ssh_grub |")
 	or die "unable to get menu.lst";
 
+    my $found = 0;
+
     while (<IN>) {
 	if (/^\s*title\s+$grub_menu\s*$/) {
 	    $grub_number++;
+	    $found = 1;
 	    last;
 	} elsif (/^\s*title\s/) {
 	    $grub_number++;
@@ -873,7 +876,7 @@ sub get_grub_index {
     close(IN);
 
     die "Could not find '$grub_menu' in /boot/grub/menu on $machine"
-	if ($grub_number < 0);
+	if (!$found);
     doprint "$grub_number\n";
 }