Wlan: move unnecessary error logs to warning

Remove frequently seen unnecessary error logs to warning and info.

Change-Id: Idbeed4f66cf89e161db0674a261e701c77ed59c8
CRs-Fixed: 971507
diff --git a/CORE/SME/src/sme_common/sme_Api.c b/CORE/SME/src/sme_common/sme_Api.c
index 7d28b7b..fe33655 100644
--- a/CORE/SME/src/sme_common/sme_Api.c
+++ b/CORE/SME/src/sme_common/sme_Api.c
@@ -9141,7 +9141,7 @@
 
     if(pSession == NULL )
     {
-        VOS_TRACE(VOS_MODULE_ID_SME, VOS_TRACE_LEVEL_ERROR, "%s: Unable to find "
+        VOS_TRACE(VOS_MODULE_ID_SME, VOS_TRACE_LEVEL_WARN, "%s: Unable to find "
             "the right session", __func__);
         return eHAL_STATUS_FAILURE;
     }