dma: sirf: use NULL instead of 0

sirfsoc_dma_prep_cyclic() returns pointer, thus NULL should be
used instead of 0 in order to fix the following sparse warning:

drivers/dma/sirf-dma.c:598:24: warning: Using plain integer as NULL pointer

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/dma/sirf-dma.c b/drivers/dma/sirf-dma.c
index 716b23e4f327..973ecd05dffd 100644
--- a/drivers/dma/sirf-dma.c
+++ b/drivers/dma/sirf-dma.c
@@ -595,7 +595,7 @@ sirfsoc_dma_prep_cyclic(struct dma_chan *chan, dma_addr_t addr,
         spin_unlock_irqrestore(&schan->lock, iflags);
 
         if (!sdesc)
-                return 0;
+                return NULL;
 
         /* Place descriptor in prepared list */
         spin_lock_irqsave(&schan->lock, iflags);