[PATCH] staging/comedi: Fix if(); by adding proper code

[Peter Huewe <peterhuewe@gmx.de>]

Smatch warns about:
staging/comedi/drivers/cb_pcidas64.c:3304 prep_ao_dma() warn: if();

So the check currently does nothing and could be removed, but the better
alternative is to activate the check again and return -1; if it
evaluates to true.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
---
 drivers/staging/comedi/drivers/cb_pcidas64.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/comedi/drivers/cb_pcidas64.c b/drivers/staging/comedi/drivers/cb_pcidas64.c
index d33fc32..782498f 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas64.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas64.c
@@ -3301,7 +3301,8 @@ static int prep_ao_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
 	num_bytes = load_ao_dma_buffer(dev, cmd);
 	if (num_bytes == 0)
 		return -1;
-	if (num_bytes >= DMA_BUFFER_SIZE) ;
+	if (num_bytes >= DMA_BUFFER_SIZE)
+		return -1;
 	load_ao_dma(dev, cmd);
 
 	dma_start_sync(dev, 0);
-- 
1.7.8.6