Apply various clang-tidy checks for smartprs and modern C++ types

code/AssetLib/MDL/MDLLoader.cpp

@@ -159,7 +159,7 @@ void MDLImporter::InternReadFile(const std::string &pFile,
     std::unique_ptr<IOStream> file(pIOHandler->Open(pFile));
 
     // Check whether we can read from the file
-    if (file.get() == nullptr) {
+    if (file == nullptr) {
         throw DeadlyImportError("Failed to open MDL file ", pFile, ".");
     }