[clang] [analyzer] Conversion to CheckerFamily: MallocChecker (PR #147080)

[Donát Nagy via cfe-commits]

================
@@ -3028,24 +2986,10 @@ void MallocChecker::HandleLeak(SymbolRef Sym, ExplodedNode *N,
   if (Family.Kind == AF_Alloca)
     return;
 
-  std::optional<MallocChecker::CheckKind> CheckKind =
-      getCheckIfTracked(Family, true);
-
-  if (!CheckKind)
+  const Leak *Frontend = getRelevantFrontendAs<Leak>(Family);
+  if (handleNullOrDisabled(Frontend, C))
----------------
NagyDonat wrote:

```suggestion
  if (!Frontend || !Frontend.isEnabled())
```

https://github.com/llvm/llvm-project/pull/147080