at_deprecated was causing a small memory leak.

src/kernel/config.c

@@ -1144,6 +1144,7 @@ void kernel_done(void)
      * calling it is optional, e.g. a release server will most likely not do it.
      */
     translation_done();
+    free_attribs();
 }
 
 attrib_type at_germs = {

src/util/attrib.c

@@ -355,3 +355,7 @@ void a_write(struct storage *store, const attrib * attribs, const void *owner)
     }
     WRITE_TOK(store, "end");
 }
+
+void free_attribs(void) {
+    cb_clear(&cb_deprecated);
+}

src/util/attrib.h

@@ -79,6 +79,8 @@ extern "C" {
     extern void a_write(struct storage *store, const attrib * attribs,
         const void *owner);
 
+    void free_attribs(void);
+
 #define DEFAULT_AGE NULL
 #define DEFAULT_INIT NULL
 #define DEFAULT_FINALIZE NULL