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_rx_defrag.c

@@ -355,7 +355,7 @@ static QDF_STATUS dp_rx_defrag_fraglist_insert(struct dp_peer *peer, unsigned ti
 			cur = frag;
 			*head_addr = frag; /* head pointer to be updated */
 		} else {
-			while ((cur_fragno > head_fragno) && cur != NULL) {
+			while ((cur_fragno > head_fragno) && cur) {
 				prev = cur;
 				cur = qdf_nbuf_next(cur);
 				rx_desc_info = qdf_nbuf_data(cur);
@@ -670,7 +670,7 @@ static QDF_STATUS dp_rx_defrag_mic(const uint8_t *key, qdf_nbuf_t wbuf,
 			break;
 
 		wbuf = qdf_nbuf_next(wbuf);
-		if (wbuf == NULL)
+		if (!wbuf)
 			return QDF_STATUS_E_DEFRAG_ERROR;
 
 		if (space != 0) {
@@ -895,7 +895,7 @@ dp_rx_defrag_nwifi_to_8023(qdf_nbuf_t nbuf, uint16_t hdrsize)
 	union dp_align_mac_addr mac_addr;
 	uint8_t *rx_desc_info = qdf_mem_malloc(RX_PKT_TLVS_LEN);
 
-	if (rx_desc_info == NULL) {
+	if (!rx_desc_info) {
 		QDF_TRACE(QDF_MODULE_ID_DP, QDF_TRACE_LEVEL_ERROR,
 			"%s: Memory alloc failed ! ", __func__);
 		QDF_ASSERT(0);
@@ -1341,7 +1341,7 @@ static QDF_STATUS dp_rx_defrag_save_info_from_ring_desc(void *ring_desc,
 	void *dst_ring_desc = qdf_mem_malloc(
 			sizeof(struct reo_destination_ring));
 
-	if (dst_ring_desc == NULL) {
+	if (!dst_ring_desc) {
 		QDF_TRACE(QDF_MODULE_ID_DP, QDF_TRACE_LEVEL_ERROR,
 			"%s: Memory alloc failed !", __func__);
 		QDF_ASSERT(0);