wlan: Avoid watchdog bark due to excessive logging

Change log level from VOS_TRACE_LEVEL_ERROR to VOS_TRACE_LEVEL_INFO
to reduce excessive log.

Change-Id: I56f8bb35235cef6eb0a98b9586f0e68a240be5c6
CRs-Fixed: 749716
diff --git a/CORE/HDD/src/wlan_hdd_main.c b/CORE/HDD/src/wlan_hdd_main.c
index 3e09a65..0e9877d 100644
--- a/CORE/HDD/src/wlan_hdd_main.c
+++ b/CORE/HDD/src/wlan_hdd_main.c
@@ -4237,7 +4237,7 @@
    pHddCtx = WLAN_HDD_GET_CTX(pAdapter);
    ret = wlan_hdd_validate_context(pHddCtx);
    if (ret) {
-      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
+      VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_INFO,
                 "%s: invalid context", __func__);
       ret = -EBUSY;
       goto exit;