staging: wilc1000: return kernel error codes from wilc_wlan_stop

return -EIO for bus failures, 0 otherwise.
Signed-off-by: Adham Abozaeid <adham.abozaeid@microchip.com>
Link: https://lore.kernel.org/r/20190809182510.22443-3-adham.abozaeid@microchip.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wlan.c

@@ -979,7 +979,7 @@ int wilc_wlan_stop(struct wilc *wilc, struct wilc_vif *vif)
 	if (!ret) {
 		netdev_err(vif->ndev, "Error while reading reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return ret;
+		return -EIO;
 	}
 
 	ret = wilc->hif_func->hif_write_reg(wilc, WILC_GP_REG_0,
@@ -987,14 +987,14 @@ int wilc_wlan_stop(struct wilc *wilc, struct wilc_vif *vif)
 	if (!ret) {
 		netdev_err(vif->ndev, "Error while writing reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return ret;
+		return -EIO;
 	}
 
 	ret = wilc->hif_func->hif_read_reg(wilc, WILC_FW_HOST_COMM, &reg);
 	if (!ret) {
 		netdev_err(vif->ndev, "Error while reading reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return ret;
+		return -EIO;
 	}
 	reg = BIT(0);
 
@@ -1002,12 +1002,12 @@ int wilc_wlan_stop(struct wilc *wilc, struct wilc_vif *vif)
 	if (!ret) {
 		netdev_err(vif->ndev, "Error while writing reg\n");
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
-		return ret;
+		return -EIO;
 	}
 
 	release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 
-	return ret;
+	return 0;
 }
 
 void wilc_wlan_cleanup(struct net_device *dev)