USB: remove warn macro from HID core

There were two stragglers that got missed in the last merge of the HID tree that forgot to change the warn() calls to dev_warn().  This patch fixes them up.

Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>