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

drivers/staging/rts5208/rtsx.c

@@ -596,8 +596,7 @@ static irqreturn_t rtsx_interrupt(int irq, void *dev_id)
 		spin_unlock(&dev->reg_lock);
 		if (chip->int_reg == 0xFFFFFFFF)
 			return IRQ_HANDLED;
-		else
-			return IRQ_NONE;
+		return IRQ_NONE;
 	}
 
 	status = chip->int_reg;