staging: r8188eu: don't check the category in OnAction_back

Do not check the category in OnAction_back. OnAction has already checked
the category before calling OnAction_back.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220508161451.115847-3-martin@kaiser.cx


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