Commits on Aug 18, 2021

1. refactor(ffi): check pointer arguments for NULL …

   This changes all the extern C functions in `hyper::ffi` to check passed
   pointer arguments for being `NULL` before trying to use them. Before, we
   would just assume the programmer had passed a good pointer, which could
   result in segmentation faults. Now:
   
   - In debug builds, it will assert they aren't null, and so if they are,
     a message identifying the argument name will be printed and then the
     process will crash.
   - In release builds, it will still check for null, but if found, it will
     return early, with a return value indicating failure if the return type
     allows (such as returning NULL, or `HYPERE_INVALID_ARG`).

   

   seanmonstar committed Aug 18, 2021
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