Use a reference instead of a pointer. NFC.

llvm-svn: 272719
diff --git a/lld/ELF/Symbols.cpp b/lld/ELF/Symbols.cpp
index 2f7749f..ce90549 100644
--- a/lld/ELF/Symbols.cpp
+++ b/lld/ELF/Symbols.cpp
@@ -221,13 +221,13 @@
 }
 
 std::unique_ptr<InputFile> LazyArchive::getFile() {
-  MemoryBufferRef MBRef = File->getMember(&Sym);
+  MemoryBufferRef MBRef = File.getMember(&Sym);
 
   // getMember returns an empty buffer if the member was already
   // read from the library.
   if (MBRef.getBuffer().empty())
     return std::unique_ptr<InputFile>(nullptr);
-  return createObjectFile(MBRef, File->getName());
+  return createObjectFile(MBRef, File.getName());
 }
 
 std::unique_ptr<InputFile> LazyObject::getFile() {