staging: rtl8192e: Remove rtllib_get_payload()

rtllib_process_action() is only called in one place with management
frames. Frame is passed over to rtllib_get_payload() which passes it to
rtllib_get_hdrlen(). In rtllib_get_hdrlen() all management frames
return with hdrlen = RTLLIB_3ADDR_LEN. Therefore the switch in
rtllib_get_payload() is useless and dead code. The condition act == NULL
cannot occur and can also be removed. Then rtllib_hdr_2addr is not used
anymore and can be removed as well.

Signed-off-by: Philipp Hortmann <[email protected]>
Link: https://lore.kernel.org/r/3ef288fb819f50da3eb9291522067babaa57f532.1694546301.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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