[include-cleaner] Fix -Wpessimizing-move in IncludeCleaner.cpp (NFC)

/llvm-project/clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp:302:14:
error: moving a temporary object prevents copy elision [-Werror,-Wpessimizing-move]
      return std::move(llvm::errorCodeToError(Err));
             ^
/llvm-project/clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp:302:14: note: remove std::move call here
      return std::move(llvm::errorCodeToError(Err));
             ^~~~~~~~~~                           ~
1 error generated.

Author: DamonFool

clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp

@@ -299,7 +299,7 @@ mapInputsToAbsPaths(clang::tooling::CompilationDatabase &CDB,
     if (auto Err = VFS->makeAbsolute(AbsPath)) {
       llvm::errs() << "Failed to get absolute path for " << Source << " : "
                    << Err.message() << '\n';
-      return std::move(llvm::errorCodeToError(Err));
+      return llvm::errorCodeToError(Err);
     }
     std::vector<clang::tooling::CompileCommand> Cmds =
         CDB.getCompileCommands(AbsPath);