qcacld-3.0: Add a check for driver status in wlansap_set_band_csa

with a new change I9b2b1ead3b4502022aeefc08359037457bb051f9 added for
to switch from 2.4g from 5g when an indication is received, During the
driver re-initliazation also this function is getting invoked and trying
access freed memory resulting in null pointer deference.

Donot process the function wlansap_set_band_csa when the driver is
recovering.

Change-Id: Iab67d5b77ffc98166bf421ff30bcf641e37fef6a
CRs-Fixed: 2587706

core/sap/src/sap_module.c

@@ -3158,6 +3158,9 @@ void wlansap_set_band_csa(struct sap_context *sap_ctx,
 	uint8_t vdev_id;
 	enum reg_wifi_band sap_band;
 
+	if (cds_is_driver_recovering())
+		return;
+
 	sap_band = wlan_reg_freq_to_band(sap_ctx->chan_freq);
 	sap_debug("SAP/Go current band: %d, pdev band capability: %d",
 		  sap_band, band);