Fix a build error (llvm#133957)

This fixes error reported in post-commit testing of
llvm#133797
LOG: https://lab.llvm.org/buildbot/#/builders/140/builds/20266

Thanks

Signed-off-by: Arvind Sudarsanam <arvind.sudarsanam@intel.com>

Author: asudarsa

clang/tools/clang-sycl-linker/ClangSYCLLinker.cpp

@@ -205,7 +205,7 @@ Expected<std::unique_ptr<Module>> getBitcodeModule(StringRef File,
 
   auto M = getLazyIRFileModule(File, Err, C);
   if (M)
-    return M;
+    return std::move(M);
   return createStringError(Err.getMessage());
 }