qcacmn: Introduce wmi_validate_handle()

Introduce wmi_validate_handle() with the caller function name
embedded in it to validate the WMI handle and log incase
of error. Calling functions can avoid logging in case
wmi_validate_handle() returns -EINVAL. This reduces logging and
thereby memory foot print.

Change-Id: Ie0a6a84ffad6e5cf2da8f547c7209dc77cdf5729
CRs-Fixed: 2838960

wmi/src/wmi_unified.c

@@ -3639,3 +3639,13 @@ void wmi_pdev_id_conversion_enable(wmi_unified_t wmi_handle,
 							       pdev_id_map,
 							       size);
 }
+
+int __wmi_validate_handle(wmi_unified_t wmi_handle, const char *func)
+{
+        if (!wmi_handle) {
+                wmi_err("Invalid WMI handle (via %s)", func);
+                return -EINVAL;
+        }
+
+        return 0;
+}