add missing DBUG_RETURN-s

mysys/my_getopt.c

@@ -486,7 +486,7 @@ int handle_options(int *argc, char ***argv,
 				     "unsupported by option '--%s'",
                                      my_progname, optp->name);
 	    if (!option_is_loose)
-	      return EXIT_ARGUMENT_INVALID;
+	      DBUG_RETURN(EXIT_ARGUMENT_INVALID);
 	    continue;
 	  }
 	  else

storage/myisam/sort.c

@@ -529,6 +529,7 @@ ok:
       mysql_cond_signal(&sort_param->sort_info->cond);
     mysql_mutex_unlock(&sort_param->sort_info->mutex);
     DBUG_PRINT("exit", ("======== ending thread ========"));
+    DBUG_LEAVE;
   }
   my_thread_end();
   return NULL;

tests/mysql_client_test.c

@@ -17175,7 +17175,7 @@ static void test_bug28386()
     if (! opt_silent)
       printf("Skipping the test since logging to tables is not enabled\n");
     /* Log output is not to tables */
-    return;
+    DBUG_VOID_RETURN;
   }
   mysql_free_result(result);