Fix #1996, Heap off-by-one in utest
Fix #1996, Heap off-by-one in utest

winlinvip/srs,winlinvip/srs,ossrs/srs,winlinvip/srs,ossrs/srs,ossrs/srs,ossrs/srs,winlinvip/srs,winlinvip/simple-rtmp-server,winlinvip/srs,ossrs/srs,winlinvip/srs,ossrs/srs