drivers/*: mark variables with uninitialized_var()

Mark variables in drivers/* with uninitialized_var() if such a warning
appears, and analysis proves that the var is initialized properly on all
paths it is used.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/usb/misc/auerswald.c b/drivers/usb/misc/auerswald.c
index 3e22b2f..42d4e64 100644
--- a/drivers/usb/misc/auerswald.c
+++ b/drivers/usb/misc/auerswald.c
@@ -664,7 +664,7 @@
 	int ret;
 	struct usb_ctrlrequest *dr;
 	struct urb *urb;
-        int length;
+        int uninitialized_var(length);
 
         dbg ("auerchain_control_msg");
         dr = kmalloc (sizeof (struct usb_ctrlrequest), GFP_KERNEL);