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nusb/cam: interrupt reader proc on close to unstuck it

--- a/sys/src/cmd/nusb/cam/video.c

+++ b/sys/src/cmd/nusb/cam/video.c

@@ -298,6 +298,7 @@

 	if(c->active == 0 || c->abort)

 		return;

 	c->abort = -1;

+	threadint(c->cvtid);

 }

 void