ath10k: remove an unnecessary NULL check

The "survey" pointer is the address of an array element.  We know that
it can't be NULL so this check can be removed.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath10k/wmi.c

@@ -2582,7 +2582,7 @@ static void ath10k_wmi_event_chan_info_unpaired(struct ath10k *ar,
 
 	survey = &ar->survey[idx];
 
-	if (!params->mac_clk_mhz || !survey)
+	if (!params->mac_clk_mhz)
 		return;
 
 	memset(survey, 0, sizeof(*survey));