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kobject_init_and_add() takes reference even when it fails.
According to the doc of kobject_init_and_add()

   If this function returns an error, kobject_put() must be called to
   properly clean up the memory associated with the object.

Fix this issue by calling kobject_put().

Fixes: 948af1f0

 ("firmware: Basic dmi-sysfs support")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220511071421.9769-1-linmq006@gmail.com

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>