SuccessChanges

Summary

  1. Fix "pointer is null" static analyzer warnings. NFCI. (details)
Commit ad201691d5cc0f15f6f885f3847dcc6440ee3de5 by llvm-dev
Fix "pointer is null" static analyzer warnings. NFCI.
Use cast<> instead of dyn_cast<> and move into its users where its
dereferenced immediately.
The file was modifiedclang/lib/StaticAnalyzer/Checkers/CStringChecker.cpp