[PATCH] ide: fix warning comparing pointer to 0

Fix the following coccicheck warning:

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

Reported-by: Abaci Robot <redacted>
Signed-off-by: Jiapeng Chong <redacted>
---
 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..d5171e0 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;