Simplify assertion.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@98176 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/RegionStore.cpp b/lib/Checker/RegionStore.cpp
index b320170..b53fdee 100644
--- a/lib/Checker/RegionStore.cpp
+++ b/lib/Checker/RegionStore.cpp
@@ -1334,11 +1334,7 @@
 SVal RegionStoreManager::RetrieveStruct(Store store, const TypedRegion* R) {
   QualType T = R->getValueType(getContext());
   assert(T->isStructureType());
-
-  const RecordType* RT = T->getAsStructureType();
-  RecordDecl* RD = RT->getDecl();
-  assert(RD->isDefinition());
-  (void)RD;
+  assert(T->getAsStructureType()->getDecl()->isDefinition());
   return ValMgr.makeLazyCompoundVal(store, R);
 }