iwlwifi: mvm: fix scan config command size

Use the actual length of channels array and not the max capable length.
Signed-off-by: Beker Ayala <ayala.beker@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/scan.c

@@ -1205,7 +1205,7 @@ int iwl_mvm_config_scan(struct iwl_mvm *mvm)
 		cmd_size = sizeof(struct iwl_scan_config);
 	else
 		cmd_size = sizeof(struct iwl_scan_config_v1);
-	cmd_size += mvm->fw->ucode_capa.n_scan_channels;
+	cmd_size += num_channels;
 
 	cfg = kzalloc(cmd_size, GFP_KERNEL);
 	if (!cfg)