[tex-k] Minor memory leak in kpathsea and a patch

[Yifei Zheng]

Hi, all

I've been messing around with the texlive source distribution for a 
while. But I do notice some minor memory leak when ran under valgrind. 
I've attached the valgrind error report for reference. (Ran on 
ArchLinux, using kpathsea from arch repository, self-compiled pdftex) 
I'm not sure if this has been brought up before on the mailing list.

The memory leak is fairly manageable as it doesn't seem to scale too 
much. Nonetheless, I thought it may be beneficial to have them fixed. So 
I made a patch with respect to the 2019.3 source. It solves many but 
sadly not all of the leaks (as tested with my modified pdftex executable).

*Disclaimer* I'm only a casual user of TeX, and I don't know much about 
the internal structure of kpathsea (as in I don't know what internal 
functions are supposed return new memory or return references). But I 
hope it's somewhat useful.

Best,
Yifei

-- 
Yifei Zheng
Mechanical Engineering
Purdue University, Class of 2021
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