qcacmn: Fix static code analysis issues in DP

In dp_srng_init, max_buffer_length and prefetch_timer are used
while uninitialized.

In dp_bucket_index, overrunning array cdp_sw_enq_delay leads to
out-of-bounds access.

In dp_rx_defrag_fraglist_insert, cur is first NULL checked but
cur is again set to qdf_nbuf_next and is accessed without
NULL check. Thus do a NULL check again before dereferencing
cur to avoid potential NULL pointer dereference.

In htt_t2h_stats_handler, soc could be NULL while cmn_init_done
is dereferenced. Thus fix it by NULL check soc first and then
dereference cmn_init_done.

Change-Id: Ie6a33347d34862f30ba04a10096d3892af7571d3
CRs-Fixed: 2751573

dp/wifi3.0/dp_htt.c

@@ -2103,10 +2103,16 @@ void htt_t2h_stats_handler(void *context)
 	uint8_t done;
 	uint32_t rem_stats;
 
-	if (!soc || !qdf_atomic_read(&soc->cmn_init_done)) {
+	if (!soc) {
 		QDF_TRACE(QDF_MODULE_ID_TXRX, QDF_TRACE_LEVEL_ERROR,
-			"soc: 0x%pK, init_done: %d", soc,
-			qdf_atomic_read(&soc->cmn_init_done));
+			  "soc is NULL");
+		return;
+	}
+
+	if (!qdf_atomic_read(&soc->cmn_init_done)) {
+		QDF_TRACE(QDF_MODULE_ID_TXRX, QDF_TRACE_LEVEL_ERROR,
+			  "soc: 0x%pK, init_done: %d", soc,
+			  qdf_atomic_read(&soc->cmn_init_done));
 		return;
 	}