Autopkgtest error of libdata-streamserializer-perl for riscv64 architecture

Hi,

I did a team upload for libdata-streamserializer-perl and realised that its
autopkgtest is failing for riscv64[1]:

192s #   Failed test 'Check memory leak (135168 bytes)'
192s #   at t/05_memory_leak.t line 63.
192s # 5712 iterations were done, 2988014 bytes were produced
192s ok 3 - Check memory checker
192s # Looks like you failed 1 test of 3.
192s Dubious, test returned 1 (wstat 256, 0x100)
192s Failed 1/3 subtests 

I need to admit I have no idea how to deal with this.

Any ideas
    Andreas.

[1] https://ci.debian.net/packages/libd/libdata-streamserializer-perl/testing/riscv64/57475523/