staging: rts5208: Remove unnecessary else in rtsx_card.h

The following patch fixes the checkpatch.pl warning:
WARNING: else is not generally useful after a break or return

Signed-off-by: Esra Altintas <es.altintas@gmail.com>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>