[clang] [Clang][Sema] Warn on a function reference compared/converted to null (PR #204944)

[Corentin Jabot via cfe-commits]

================
@@ -14296,6 +14299,10 @@ void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
   if (!IsFunction)
     return;
 
+  // The fix-it notes below only apply to a bare function name, not a 
reference.
+  if (IsFunctionReference)
+    return;
----------------
cor3ntin wrote:

Please merge these 2 `if`s. Thanks

https://github.com/llvm/llvm-project/pull/204944
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