[clang] [Clang] Prevent potential null pointer dereferences (PR #117176)

[via cfe-commits]

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@@ -627,7 +627,7 @@ class Analyzer {
           IsNoexcept = isNoexcept(FD);
         } else if (auto *BD = dyn_cast<BlockDecl>(D)) {
           if (auto *TSI = BD->getSignatureAsWritten()) {
-            auto *FPT = TSI->getType()->getAs<FunctionProtoType>();
+            auto *FPT = TSI->getType()->castAs<FunctionProtoType>();
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Sirraide wrote:

Well, also, we only get here if we’re analysing a block. Can blocks be 
prototypeless? I hope not...

https://github.com/llvm/llvm-project/pull/117176
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