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pnp_add_device() may fail so we need to handle errors and avoid leaking memory. Also, when pnp_alloc_dev fails, return -ENOMEM rather than -1. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>