[csmith-project/creduce] 893dac: removed unneeded nullptr checks

[Yang Chen <noreply@github.com>]

  Branch: refs/heads/master
  Home:   https://github.com/csmith-project/creduce
  Commit: 893dacdf85ea2058fc5de22f927358b16120f731
      https://github.com/csmith-project/creduce/commit/893dacdf85ea2058fc5de22f927358b16120f731
  Author: Yang Chen <chenyang@cs.utah.edu>
  Date:   2020-04-26 (Sun, 26 Apr 2020)

  Changed paths:
    M clang_delta/ReduceArraySize.cpp
    M clang_delta/RemoveArray.cpp
    M clang_delta/RenameParam.cpp
    M clang_delta/ReplaceArrayIndexVar.cpp
    M clang_delta/ReplaceUndefinedFunction.cpp
    M clang_delta/TransformationManager.cpp

  Log Message:
  -----------
  removed unneeded nullptr checks

This commit was copied from marxin's fix to the same issue (i.e. #208).