libubus: add null for ubus_context object in ubus_shutdown()

At the moment, we do our own null checks before calling ubus_free().
The likely-hood of 'ctx' being null (in ubus_free()) is low,
but since free() handles null, might make sense for ubus_free() to do so as well.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

diff --git a/libubus.c b/libubus.c
index bfbaeb6..d52faff 100644 (file)
--- a/libubus.c
+++ b/libubus.c
@@ -358,6 +358,8 @@ struct ubus_context *ubus_connect(const char *path)
 void ubus_shutdown(struct ubus_context *ctx)
 {
        blob_buf_free(&b);
+       if (!ctx)
+               return;
        close(ctx->sock.fd);
        free(ctx->msgbuf.data);
 }