This webcam should be identified as:

uvideo1 at uhub1 port 2 configuration 1 interface 0 "Logitech Webcam C270" rev 
2.00/0.10 addr 3
video1 at uvideo1
uaudio0 at uhub1 port 2 configuration 1 interface 2 "Logitech Webcam C270" rev 
2.00/0.10 addr 3
uaudio0: audio descriptors make no sense, error=4
ugen0 at uhub1 port 2 configuration 1 "Logitech Webcam C270" rev 2.00/0.10 addr 
3

The audio error seems to be 'a descriptor length is not what uaudio(4) 
expects.',
according Jacob Meuser [1] but I'm not using audio so if anyone wants more
information like lsusb or usbdevs I can get it.

Here's the patch:
Index: usbdevs
===================================================================
RCS file: /cvs/src/sys/dev/usb/usbdevs,v
retrieving revision 1.591
diff -u -p -r1.591 usbdevs
--- usbdevs     14 Nov 2012 16:53:49 -0000      1.591
+++ usbdevs     18 Nov 2012 16:38:21 -0000
@@ -2389,6 +2389,7 @@ product LOGITECH M4848            0x0301  M4848 mou
 product LOGITECH PAGESCAN      0x040f  PageScan
 product LOGITECH QUICKCAMWEB   0x0801  QuickCam Web
 product LOGITECH WEBCAMC200    0x0802  Webcam C200
+product LOGITECH WEBCAMC270     0x0825  Webcam C270
 product LOGITECH WEBCAMC500    0x0807  Webcam C500
 product LOGITECH QUICKCAMPRO   0x0810  QuickCam Pro
 product LOGITECH HDPROC910     0x0821  HD Pro Webcam C910


[1] http://marc.info/?l=openbsd-misc&m=127952355322151&w=2

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