Patch to avoid segfault in kallisto

[Pranav Ballaney <ballaneypranav@gmail.com>]

Hi,

I investigated the segfault issue in kallisto, and found a fix for it. 

Details can be found at https://github.com/pachterlab/kallisto/issues/254#issuecomment-629546051

I've written a patch to avoid the segfault, for the time being, until upstream fixes it. 

Please take a look.

https://salsa.debian.org/med-team/kallisto

Regards,

Pranav

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