umass regression

[Bartosz Fabianowski]

With USB_DEBUG, I see that da0 has the NO_SYNCHRONIZE_CACHE set. But I 
still have no idea where the second umass device is gone that used to 
show up in 8-STABLE :(. Is there any other debug option I could enable 
to chase after that? I see no trace of another umass or even a ugen device.

- Bartosz

Here is the output I get now:

ugen1.3: <vendor 0x091e> at usbus1
umass0: <vendor 0x091e product 0x23c0, class 0/0, rev 1.10/5.09, addr 3> 
on usbus1
umass0:  SCSI over Bulk-Only; quirks = 0x4000
umass0:3:0:-1: Attached to scbus3
da0 at umass-sim0 bus 0 scbus3 target 0 lun 0
da0: <Garmin GARMIN Flash 1.00> Removable Direct Access SCSI-5 device
da0: 1.000MB/s transfers
da0: 934MB (1912832 512 byte sectors: 64H 32S/T 934C)