cross-tree: phase out dma_zalloc_coherent()

We already need to zero out memory for dma_alloc_coherent(), as such
using dma_zalloc_coherent() is superflous. Phase it out.

This change was generated with the following Coccinelle SmPL patch:

@ replace_dma_zalloc_coherent @
expression dev, size, data, handle, flags;
@@

-dma_zalloc_coherent(dev, size, handle, flags)
+dma_alloc_coherent(dev, size, handle, flags)

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
[hch: re-ran the script on the latest tree]
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/ntb/hw/mscc/ntb_hw_switchtec.c

@@ -1339,10 +1339,10 @@ static int switchtec_ntb_init_shared_mw(struct switchtec_ntb *sndev)
 	int rc;
 
 	sndev->nr_rsvd_luts++;
-	sndev->self_shared = dma_zalloc_coherent(&sndev->stdev->pdev->dev,
-						 LUT_SIZE,
-						 &sndev->self_shared_dma,
-						 GFP_KERNEL);
+	sndev->self_shared = dma_alloc_coherent(&sndev->stdev->pdev->dev,
+						LUT_SIZE,
+						&sndev->self_shared_dma,
+						GFP_KERNEL);
 	if (!sndev->self_shared) {
 		dev_err(&sndev->stdev->dev,
 			"unable to allocate memory for shared mw\n");