Post Fix to Bug#14628410 - ASSERTION `! IS_SET()' FAILED IN

DIAGNOSTICS_AREA::SET_OK_STATUS

Use DBUG_RETURN() instead of return() if DBUG_ENTER() is
used in the function. This patch is to  fix the Windows 
pb2 failure on mysql-5.1

Approved by Marko. rb#1792

storage/innodb_plugin/handler/ha_innodb.cc

@@ -1142,7 +1142,7 @@ innobase_mysql_tmpfile(void)
 
 	DBUG_EXECUTE_IF(
 		"innobase_tmpfile_creation_failure",
-		return(-1);
+		DBUG_RETURN(-1);
 	);
 
 	tmpdir = my_tmpdir(&mysql_tmpdir_list);