gma500: Fix uninitialized variable and style issues

The return variable of psb_gtt_pin() may be used
uninitialized. Also fixed some coding style issues.
Signed-off-by: Andre Bartke <andre.bartke@gmail.com>
[Reapplied by hand due to other changes]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/gma500/psb_gtt.c

@@ -126,7 +126,7 @@ static void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r)
 	WARN_ON(r->stolen);
 
 	gtt_slot = psb_gtt_entry(dev, r);
-	pte = psb_gtt_mask_pte(page_to_pfn(dev_priv->scratch_page), 0);;
+	pte = psb_gtt_mask_pte(page_to_pfn(dev_priv->scratch_page), 0);
 
 	for (i = 0; i < numpages; i++)
 		iowrite32(pte, gtt_slot++);
@@ -215,7 +215,7 @@ static void psb_gtt_detach_pages(struct gtt_range *gt)
  */
 int psb_gtt_pin(struct gtt_range *gt)
 {
-	int ret;
+	int ret = 0;
 	struct drm_device *dev = gt->gem.dev;
 	struct drm_psb_private *dev_priv = dev->dev_private;