staging: r8188eu: the frame type is shifted out

The index calculation in mgt_dispatcher does not use the frame type. The
4-bit right shift ignores protocol version and frame type.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220417102221.466524-4-martin@kaiser.cx


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