Fix x width mapping when 720x480 mode is forced using -M1

Fix x width mapping when 720x480 mode is forced using -M1

When the ch7036_monitor code is run with the -M1 flag to force
720x480@60 the aspect ratio cannot be computed (because it is non-standard)
this causes the width remapping to index -1 in the array and get bogus
width data.

This is fixed by not remapping when the aspect is negative.

BUG=chrome-os-partner:2850
TEST=sudo ch7036_monitor -v -M1 check picture remains when monitor attached

Change-Id: Ic0c55bba544b5a890bdeba37a36f85cb28f9c533

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=08e79d5

[mdhayter, 2011-04-02 22:18:28]

Please review fix for -M1 issue

[tbroch1, 2011-04-02 23:06:38]

LGTM
On 2011/04/02 22:18:28, mdhayter wrote:
> Please review fix for -M1 issue