microblaze: Fix consistent-sync code

PCI_DMA_FROMDEVICE should call invalidation not flushing.

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/mm/consistent.c b/arch/microblaze/mm/consistent.c
index 713431c..5a59dad 100644
--- a/arch/microblaze/mm/consistent.c
+++ b/arch/microblaze/mm/consistent.c
@@ -229,7 +229,7 @@
 	case PCI_DMA_NONE:
 		BUG();
 	case PCI_DMA_FROMDEVICE:	/* invalidate only */
-		flush_dcache_range(start, end);
+		invalidate_dcache_range(start, end);
 		break;
 	case PCI_DMA_TODEVICE:		/* writeback only */
 		flush_dcache_range(start, end);