staging: r8188eu: in_cta_test is always 0

in_cta_test in struct adapter is never set, so it's always 0.

Remove in_cta_test and related dead code.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220206161809.423031-12-martin@kaiser.cx


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