Automatically init/exit libmdb code

mdb_init() and mdb_exit() are now deprecated.

src/util/prdata.c

@@ -29,7 +29,6 @@ main(int argc, char **argv)
 		exit(1);
 	}
 	
-	mdb_init();
 	mdb = mdb_open(argv[1], MDB_NOFLAGS);
 
 	table = mdb_read_table_by_name(mdb, argv[2], MDB_TABLE);
@@ -40,8 +39,7 @@ main(int argc, char **argv)
 	}
 
 	mdb_close(mdb);
-	mdb_exit();
 
-	exit(0);
+	return 0;
 }