iwlwifi: fw: init SAR GEO table only if data is present

When no table data was read from ACPI, then filling the data
and returning success here will fill zero values, which means
transmit power will be limited to 0 dBm. This is clearly not
intended.

Return an error from iwl_sar_geo_init() if there's no data to
fill into the command structure.

Cc: stable@vger.kernel.org
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Fixes: 78a19d52 ("iwlwifi: mvm: Read the PPAG and SAR tables at INIT stage")
Signed-off-by: NGregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20220517120044.bc45923b74e9.Id2b4362234b7f8ced82c591b95d4075dd2ec12f4@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/acpi.c

@@ -937,6 +937,9 @@ int iwl_sar_geo_init(struct iwl_fw_runtime *fwrt,
 {
 	int i, j;
 
+	if (!fwrt->geo_enabled)
+		return -ENODATA;
+
 	if (!iwl_sar_geo_support(fwrt))
 		return -EOPNOTSUPP;