Fix the following coccicheck warning:

./drivers/ide/pmac.c:1680:38-39: WARNING comparing pointer to 0.

Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.ch...@linux.alibaba.com>
---
Changes in v2:
  - Modified if condition.

 drivers/ide/pmac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ide/pmac.c b/drivers/ide/pmac.c
index ea0b064..8e1388b 100644
--- a/drivers/ide/pmac.c
+++ b/drivers/ide/pmac.c
@@ -1677,7 +1677,7 @@ static int pmac_ide_init_dma(ide_hwif_t *hwif, const 
struct ide_port_info *d)
        /* We won't need pci_dev if we switch to generic consistent
         * DMA routines ...
         */
-       if (dev == NULL || pmif->dma_regs == 0)
+       if (!dev || !pmif->dma_regs)
                return -ENODEV;
        /*
         * Allocate space for the DBDMA commands.
-- 
1.8.3.1

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