staging: et131x: Use braces on all arms of if/else in et131x_handle_recv_pkts

The 'if' blocks have braces, so the 'else' blocks should too.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>