xlog: fix a memory leak in xlog_write_meta()
xlog: fix a memory leak in xlog_write_meta()

Free the vclock_to_string() buffer in all cases.

ocelot-inc/tarantool,rtsisyk/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool,ocelot-inc/tarantool,rtsisyk/tarantool,mejedi/tarantool,ocelot-inc/tarantool,rtsisyk/tarantool,mejedi/tarantool,mejedi/tarantool,mejedi/tarantool