altosui: Accept serial number of zero for eeprom download
authorKeith Packard <keithp@keithp.com>
Wed, 17 Oct 2012 04:54:23 +0000 (21:54 -0700)
committerKeith Packard <keithp@keithp.com>
Wed, 17 Oct 2012 04:54:23 +0000 (21:54 -0700)
AVR-based products don't have a valid serial number, and so usually
report 0. Accept this by making the 'no serial number' case check for
negative values.

Signed-off-by: Keith Packard <keithp@keithp.com>

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