staging: r8188eu: merge _mgt_dispatcher into mgt_dispatcher

All that the _mgt_dispatcher function does is to call a function from
a function pointer. It's not worth having a separate function for this.

Merge _mgt_dispatcher into mgt_dispatcher.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220413200742.276806-3-martin@kaiser.cx


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