ClangImporter: Fix an unused variable warning

Author: slavapestov

lib/ClangImporter/ImportDecl.cpp

@@ -5346,7 +5346,7 @@ Decl *SwiftDeclConverter::importGlobalAsMethod(
               dc->getAsNominalTypeOrNominalTypeExtensionContext()) {
         if (auto clangDCTy = dyn_cast_or_null<clang::TypedefNameDecl>(
                 nominalTypeDecl->getClangDecl()))
-          if (auto newtypeAttr = getSwiftNewtypeAttr(clangDCTy, getVersion()))
+          if (getSwiftNewtypeAttr(clangDCTy, getVersion()))
             if (clangDCTy->getUnderlyingType().getCanonicalType() !=
                 selfParamTy->getPointeeType().getCanonicalType())
               selfIsInOut = false;