[gold] Fix compilation (#130334)

After #115331.

llvm/tools/gold/gold-plugin.cpp

diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
index b42bfbe..256933d 100644
--- a/llvm/tools/gold/gold-plugin.cpp
+++ b/llvm/tools/gold/gold-plugin.cpp
@@ -1117,10 +1117,10 @@
         std::make_unique<llvm::raw_fd_ostream>(FD, true));
   };
 
-  auto AddBuffer = [&](size_t Task, const Twine &moduleName,
+  auto AddBuffer = [&](size_t Task, const Twine &ModuleName,
                        std::unique_ptr<MemoryBuffer> MB) {
-    auto Stream = *AddStream(Task, ModuleName);
-    Stream->OS << MB->getBuffer();
+    auto Stream = AddStream(Task, ModuleName);
+    *Stream->OS << MB->getBuffer();
     check(Stream->commit(), "Failed to commit cache");
   };