rsi: add fix for crash during assertions

commit abd39c6d upstream.

Observed crash in some scenarios when assertion has occurred,
this is because hw structure is freed and is tried to get
accessed in some functions where null check is already
present. So, avoided the crash by making the hw to NULL after
freeing.
Signed-off-by: Sanjay Konduri <sanjay.konduri@redpinesignals.com>
Signed-off-by: Sushant Kumar Mishra <sushant.mishra@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/wireless/rsi/rsi_91x_mac80211.c

@@ -199,6 +199,7 @@ void rsi_mac80211_detach(struct rsi_hw *adapter)
 		ieee80211_stop_queues(hw);
 		ieee80211_unregister_hw(hw);
 		ieee80211_free_hw(hw);
+		adapter->hw = NULL;
 	}
 
 	rsi_remove_dbgfs(adapter);