[Diagnostics] Fixed crash with non pointer type (PR43950)

Author: davidbolvansky

clang/lib/Sema/SemaExpr.cpp

@@ -482,7 +482,8 @@ static void CheckForNullPointerDereference(Sema &S, Expr *E) {
   // to get a deterministic trap and are surprised by clang's behavior.  This
   // only handles the pattern "*null", which is a very syntactic check.
   const auto *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts());
-  if (UO && UO->getOpcode() == UO_Deref) {
+  if (UO && UO->getOpcode() == UO_Deref &&
+      UO->getSubExpr()->getType()->isPointerType()) {
     const LangAS AS =
         UO->getSubExpr()->getType()->getPointeeType().getAddressSpace();
     if ((!isTargetAddressSpace(AS) ||