staging: r8188eu: simplify delay conditions in rtw_pwr_wakeup

Simplify the conditions for a loop in rtw_pwr_wakeup that waits while
the system is suspended.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220413193654.258507-2-martin@kaiser.cx


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