[ALSA] au88x0: Remove unneeded call to pci_dma_supported()

Modules: au88x0 driver

pci_dma_supported() is called right before pci_set_dma_mask() which already
calls pci_dma_supported().  The attached patch removes the unneeded call to
pci_dma_supported()

Additionally the custom VORTEX_DMA_MASK macro is replaced by DMA_32BIT_MASK
from linux/dma-mapping.h

Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/au88x0/au88x0.c

@@ -20,6 +20,7 @@
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
 #include <sound/initval.h>
 
 // module parameters (see "Module Parameters")
@@ -150,11 +151,10 @@ snd_vortex_create(struct snd_card *card, struct pci_dev *pci, vortex_t ** rchip)
 	// check PCI availability (DMA).
 	if ((err = pci_enable_device(pci)) < 0)
 		return err;
-	if (!pci_dma_supported(pci, VORTEX_DMA_MASK)) {
+	if (pci_set_dma_mask(pci, DMA_32BIT_MASK)) {
 		printk(KERN_ERR "error to set DMA mask\n");
 		return -ENXIO;
 	}
-	pci_set_dma_mask(pci, VORTEX_DMA_MASK);
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL)

sound/pci/au88x0/au88x0.h

@@ -39,8 +39,6 @@
 #include "au88x0_wt.h"
 #endif
 
-#define	VORTEX_DMA_MASK	0xffffffff
-
 #define	hwread(x,y) readl((x)+((y)>>2))
 #define	hwwrite(x,y,z) writel((z),(x)+((y)>>2))