Staging: rts5208: rtsx_transport.c: Fix comparisons to NULL

This patch changes all comparsions to NULL with !..., as reported by
checkpatch.pl.
Signed-off-by: Shaun Ren <shaun.ren@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rts5208/rtsx_transport.c

@@ -339,7 +339,7 @@ static int rtsx_transfer_sglist_adma_partial(struct rtsx_chip *chip, u8 card,
 	struct scatterlist *sg_ptr;
 	u32 val = TRIG_DMA;
 
-	if ((sg == NULL) || (num_sg <= 0) || !offset || !index)
+	if (!sg || (num_sg <= 0) || !offset || !index)
 		return -EIO;
 
 	if (dma_dir == DMA_TO_DEVICE)
@@ -503,7 +503,7 @@ static int rtsx_transfer_sglist_adma(struct rtsx_chip *chip, u8 card,
 	long timeleft;
 	struct scatterlist *sg_ptr;
 
-	if ((sg == NULL) || (num_sg <= 0))
+	if (!sg || (num_sg <= 0))
 		return -EIO;
 
 	if (dma_dir == DMA_TO_DEVICE)
@@ -650,7 +650,7 @@ static int rtsx_transfer_buf(struct rtsx_chip *chip, u8 card, void *buf,
 	u32 val = 1 << 31;
 	long timeleft;
 
-	if ((buf == NULL) || (len <= 0))
+	if (!buf || (len <= 0))
 		return -EIO;
 
 	if (dma_dir == DMA_TO_DEVICE)