staging: r8188eu: check receiver address only once

Check only once in mgt_dispatcher that the receiver address is the local
address or the broadcast address. The second identical check can be
removed.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220417102221.466524-2-martin@kaiser.cx


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