qcacmn: dp: Replace explicit comparison to NULL

Per the Linux Kernel coding style, as enforced by the kernel
checkpatch script, pointers should not be explicitly compared to
NULL. Therefore within dp replace any such comparisons with logical
operations performed on the pointer itself.

Change-Id: I61f3adab1208682d36235421f44a048e35df346d
CRs-Fixed: 2418258

dp/wifi3.0/dp_main.c

@@ -1442,7 +1442,7 @@ static uint32_t dp_service_srngs(void *dp_ctx, uint32_t dp_budget)
 	/* Process LMAC interrupts */
 	for  (ring = 0 ; ring < MAX_PDEV_CNT; ring++) {
 		pdev = soc->pdev_list[ring];
-		if (pdev == NULL)
+		if (!pdev)
 			continue;
 		for (mac_id = 0; mac_id < NUM_RXDMA_RINGS_PER_PDEV; mac_id++) {
 			int mac_for_pdev = dp_get_mac_id_for_pdev(mac_id,
@@ -2059,7 +2059,7 @@ static int dp_hw_link_desc_pool_setup(struct dp_soc *soc)
 								 buf_size,
 								 baseaddr);
 			}
-			if (soc->wbm_idle_scatter_buf_base_vaddr[i] == NULL) {
+			if (!soc->wbm_idle_scatter_buf_base_vaddr[i]) {
 				QDF_TRACE(QDF_MODULE_ID_DP,
 					  QDF_TRACE_LEVEL_ERROR,
 					  FL("Scatter lst memory alloc fail"));
@@ -4240,7 +4240,7 @@ static QDF_STATUS dp_rxdma_ring_config(struct dp_soc *soc)
 	for (i = 0; i < MAX_PDEV_CNT; i++) {
 		struct dp_pdev *pdev = soc->pdev_list[i];
 
-		if (pdev == NULL)
+		if (!pdev)
 			continue;
 
 		for (mac_id = 0; mac_id < NUM_RXDMA_RINGS_PER_PDEV; mac_id++) {
@@ -5355,7 +5355,7 @@ static void dp_peer_authorize(struct cdp_peer *peer_handle, uint32_t authorize)
 	struct dp_peer *peer = (struct dp_peer *)peer_handle;
 	struct dp_soc *soc;
 
-	if (peer != NULL) {
+	if (peer) {
 		soc = peer->vdev->pdev->soc;
 		qdf_spin_lock_bh(&soc->peer_ref_mutex);
 		peer->authorize = authorize ? 1 : 0;