fix typo in r35183

* variable.c (mark_global_entry): fix typo in r35183.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35234 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

variable.c

@@ -460,7 +460,7 @@ readonly_setter(VALUE val, ID id, void *data, struct global_variable *gvar)
 static int
 mark_global_entry(st_data_t k, st_data_t v, st_data_t a)
 {
-    ID key = (ID)key;
+    ID key = (ID)k;
     struct global_entry *entry = (struct global_entry *)v;
     struct trace_var *trace;
     struct global_variable *var = entry->var;