Ian Dowse c62502d1f6 Fix a number of cases where ugen would panic, especially when the
device went away while open or if you tried to change the config
number while devices were open. Based on the patch from the PR with
a number of changes as discussed with the submitter.

PR:		usb/97271
Submitted by:	Anish Mistry
2006-06-05 14:44:39 +00:00
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