staging: r8188eu: drop unnecessary wrapper _rtw_alloc_network

Drop unnecessary wrapper _rtw_alloc_network and move its logic to
rtw_alloc_network.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vihas Makwana <makvihas@gmail.com>
Link: https://lore.kernel.org/r/20220422193223.11948-7-makvihas@gmail.com


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