patch 8.2.2871: unnessary VIM_ISDIGIT() calls, badly indented code

Problem:    Unnessary VIM_ISDIGIT() calls, badly indented code.
Solution:   Call skipdigits() on the next character.  Improve indenting.
            (Dominique Pellé, closes #8227)
diff --git a/src/json.c b/src/json.c
index 25349b7..db25b70 100644
--- a/src/json.c
+++ b/src/json.c
@@ -607,7 +607,7 @@
     cur_item = res;
     init_tv(&item);
     if (res != NULL)
-    init_tv(res);
+    	init_tv(res);
 
     fill_numbuflen(reader);
     p = reader->js_buf + reader->js_used;