[clang] [analyzer] Fix crash in Stream checker when using void pointers (PR #97199)

[Donát Nagy via cfe-commits]

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@@ -1034,16 +1034,16 @@ void StreamChecker::preWrite(const FnDescription *Desc, const CallEvent &Call,
   C.addTransition(State);
 }
 
-static std::optional<QualType> getPointeeType(const MemRegion *R) {
+static QualType getPointeeType(const MemRegion *R) {
   if (!R)
-    return std::nullopt;
+    return {};
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NagyDonat wrote:

It's a bit strange that here you return `{}`, while at the end of the function `QualType{}` is explicitly specified.

https://github.com/llvm/llvm-project/pull/97199