qcacmn: serialization: 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 umac serialization replace any such comparisons
with logical operations performed on the pointer itself.

Change-Id: I6b8ff46dacfd2f9a883262f6336f35f5aff499bc
CRs-Fixed: 2420150

umac/cmn_services/serialization/src/wlan_serialization_legacy_api.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -43,7 +43,7 @@ static struct wlan_objmgr_pdev *wlan_serialization_get_first_pdev(
 	for (i = 0; i < WLAN_UMAC_MAX_PDEVS; i++) {
 		pdev = wlan_objmgr_get_pdev_by_id(psoc, i,
 					WLAN_SERIALIZATION_ID);
-		if (pdev != NULL)
+		if (pdev)
 			break;
 	}