logger CHANGE rename ly_verb() to ly_log_level()

Align the setter function with the LY_LOG_LEVEL enums to simplify their
association.
diff --git a/tools/lint/main_ni.c b/tools/lint/main_ni.c
index a276030..8a94ee0 100644
--- a/tools/lint/main_ni.c
+++ b/tools/lint/main_ni.c
@@ -686,7 +686,7 @@
     }
 
     /* derefered setting of verbosity in libyang after context initiation */
-    ly_verb(verbose);
+    ly_log_level(verbose);
 
     if (ly_set_new(&mods)) {
         fprintf(stderr, "yanglint error: Preparing storage for the parsed modules failed.\n");