drm/vmwgfx: Fix a couple of compile / sparse warnings and errors

Fixes
 *) an implicit function declaration on mips,
 *) a defined but not used label on !CONFIG_INTEL_IOMMU
 *) Hopefully a couple of sparse warnings where we implicitly typecast
    integer to __le32 and vice versa.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 0b5c781..a278581 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -453,12 +453,13 @@
  */
 static int vmw_dma_select_mode(struct vmw_private *dev_priv)
 {
-	const struct dma_map_ops *dma_ops = get_dma_ops(dev_priv->dev->dev);
 	static const char *names[vmw_dma_map_max] = {
 		[vmw_dma_phys] = "Using physical TTM page addresses.",
 		[vmw_dma_alloc_coherent] = "Using coherent TTM pages.",
 		[vmw_dma_map_populate] = "Keeping DMA mappings.",
 		[vmw_dma_map_bind] = "Giving up DMA mappings early."};
+#ifdef CONFIG_X86
+	const struct dma_map_ops *dma_ops = get_dma_ops(dev_priv->dev->dev);
 
 #ifdef CONFIG_INTEL_IOMMU
 	if (intel_iommu_enabled) {
@@ -482,7 +483,9 @@
 		dev_priv->map_mode = vmw_dma_map_populate;
 #endif
 
+#ifdef CONFIG_INTEL_IOMMU
 out_fixup:
+#endif
 	if (dev_priv->map_mode == vmw_dma_map_populate &&
 	    vmw_restrict_iommu)
 		dev_priv->map_mode = vmw_dma_map_bind;
@@ -498,6 +501,10 @@
 		return -EINVAL;
 #endif
 
+#else /* CONFIG_X86 */
+	dev_priv->map_mode = vmw_dma_map_populate;
+#endif /* CONFIG_X86 */
+
 	DRM_INFO("DMA map mode: %s\n", names[dev_priv->map_mode]);
 
 	return 0;