[DynInst_API:] [dyninst/dyninst] 232114: Remove assert in block_instance::callee(std::strin...

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  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: 232114e53384960ea844e0b5d13c9d11217f1e9f
      https://github.com/dyninst/dyninst/commit/232114e53384960ea844e0b5d13c9d11217f1e9f
  Author: Tim Haines <thaines.astro@xxxxxxxxx>
  Date:   2021-02-08 (Mon, 08 Feb 2021)

  Changed paths:
    M dyninstAPI/src/unix.C

  Log Message:
  -----------
  Remove assert in block_instance::callee(std::string const&) (#999)

This was introduce by 14b6941fc in 2020 (PR #875). This fix allows both types of lookup by name, but preserves the "return NULL if not found" semantics of block_instance::callee();