Fix style issue from r220363.  No functional change.

llvm-svn: 220370
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 283f032..e6c9944 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -2525,7 +2525,7 @@
 
     const CXXRecordDecl *RD = Constructor->getParent();
 
-    if (RD->getDescribedClassTemplate() != nullptr)
+    if (RD->getDescribedClassTemplate())
       return;
 
     // Holds fields that are uninitialized.