qcacld-3.0: Validate link layer stats adapter

__wlan_hdd_open_ll_stats_debugfs() currently does not ensure the given
adapter is up. This can lead to sending an invalid vdev Id to firmware.
Ensure the given adapter is up before sending the link layer stats
request to firmware.

Change-Id: I1c81f56ec795bc782404293c0f4abd8bbeb6b124
CRs-Fixed: 2306604
2 files changed