Staging: bcm: InterfaceRx.c: Removed unused variable

This patch removes the `process_done` variable from both
format_eth_hdr_to_stack() and read_bulk_callback() (where it is
declared), as it is not used anywhere (it is set in the
format_eth_hdr_to_stack() function, but afterwards not used).

Acked-by: Kevin McKinney <klmckinney1@gmail.com>
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>