IB: Remove unneeded memset

In commit af7ddd8a62 ("Merge tag 'dma-mapping-4.21' of
git://git.infradead.org/users/hch/dma-mapping"),
dma_alloc_coherent/dmam_alloc_coherent always zeroed the returned memory.
So the memset after a coherent allocation function is not needed.

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/ocrdma/ocrdma_hw.c

@@ -1351,7 +1351,6 @@ static int ocrdma_mbx_get_ctrl_attribs(struct ocrdma_dev *dev)
 	mqe->u.nonemb_req.sge[0].pa_hi = (u32) upper_32_bits(dma.pa);
 	mqe->u.nonemb_req.sge[0].len = dma.size;
 
-	memset(dma.va, 0, dma.size);
 	ocrdma_init_mch((struct ocrdma_mbx_hdr *)dma.va,
 			OCRDMA_CMD_GET_CTRL_ATTRIBUTES,
 			OCRDMA_SUBSYS_COMMON,
@@ -1690,7 +1689,6 @@ static int ocrdma_mbx_create_ah_tbl(struct ocrdma_dev *dev)
 		goto mem_err_ah;
 	dev->av_tbl.pa = pa;
 	dev->av_tbl.num_ah = max_ah;
-	memset(dev->av_tbl.va, 0, dev->av_tbl.size);
 
 	pbes = (struct ocrdma_pbe *)dev->av_tbl.pbl.va;
 	for (i = 0; i < dev->av_tbl.size / OCRDMA_MIN_Q_PAGE_SIZE; i++) {
@@ -2903,7 +2901,6 @@ static int ocrdma_mbx_get_dcbx_config(struct ocrdma_dev *dev, u32 ptype,
 	mqe_sge->pa_hi = (u32) upper_32_bits(pa);
 	mqe_sge->len = cmd.hdr.pyld_len;
 
-	memset(req, 0, sizeof(struct ocrdma_get_dcbx_cfg_req));
 	ocrdma_init_mch(&req->hdr, OCRDMA_CMD_GET_DCBX_CONFIG,
 			OCRDMA_SUBSYS_DCBX, cmd.hdr.pyld_len);
 	req->param_type = ptype;