libyang MAINTENANCE change format of the empty loops

To improve readability and because of processing by the formatting
tools, add explicit empty block to the empty loops (for, while).
diff --git a/src/log.c b/src/log.c
index 7720aa8..9e470d2 100644
--- a/src/log.c
+++ b/src/log.c
@@ -168,7 +168,7 @@
     }
     if (eitem) {
         /* disconnect the error */
-        for (i = first; i && (i->next != eitem); i = i->next);
+        for (i = first; i && (i->next != eitem); i = i->next) {}
         assert(i);
         i->next = NULL;
         first->prev = i;