wlan: Fix uninitialized variable access

In WDI_ProcessSetAllowedActionFramesInd, driver use variable
usLen without initialization during allocation of message
buffer. This can result in usage of uninitialized variable.

Initialize usLen before usage to fix this issue.

Change-Id: I5e782b5ef5e726845fda978b03afeb5c2ded49fd
CRs-Fixed: 2195838
diff --git a/CORE/WDI/CP/src/wlan_qct_wdi.c b/CORE/WDI/CP/src/wlan_qct_wdi.c
index 3a57b30..6e5069f 100644
--- a/CORE/WDI/CP/src/wlan_qct_wdi.c
+++ b/CORE/WDI/CP/src/wlan_qct_wdi.c
@@ -38974,6 +38974,10 @@
         WDI_ASSERT(0);
         return WDI_STATUS_E_FAILURE;
     }
+    /*-----------------------------------------------------------------------
+      Get message buffer
+    -----------------------------------------------------------------------*/
+    usLen = sizeof(tHalAllowedActionFrames);
 
     if ((WDI_STATUS_SUCCESS != WDI_GetMessageBuffer(pWDICtx,
                                         WDI_SET_ALLOWED_ACTION_FRAMES_IND,