[clang] [-Wunsafe-buffer-usage] Allow strerror for %s in printf-like calls (PR #175208)

[Oliver Hunt via cfe-commits]

================
@@ -771,6 +771,11 @@ static bool isNullTermPointer(const Expr *Ptr, ASTContext &Ctx) {
       if (MD->getName() == "c_str" && RD->getName() == "basic_string")
         return true;
   }
+  if (auto *CE = dyn_cast<CallExpr>(Ptr->IgnoreParenImpCasts())) {
+    const FunctionDecl *F = CE->getDirectCallee();
+    if (F && F->getIdentifier() && F->getName() == "strerror")
----------------
ojhunt wrote:

(sorry, it's buried in the link - this is in one of the still not upstreamed parts of -fbounds-safety)

https://github.com/llvm/llvm-project/pull/175208