It seems the world isn't as frank as we thought and some devices lie
about who they are.  Fallback to the other IDENTIFY if IDENTIFY is
aborted by the device.  As this is the strategy used by IDE for a long
time, it shouldn't cause too much problem.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Cc: William Thompson <wt@electro-mechanical.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>