[Tooling] Remove a redundant call to std::unique_ptr<T>::get (NFC) (#139431)

Author: kazutakahirata

clang/unittests/Tooling/DependencyScanning/DependencyScanningFilesystemTest.cpp

@@ -197,7 +197,7 @@ TEST(DependencyScanningFilesystem, DiagnoseStaleStatFailures) {
   EXPECT_EQ(Path1Exists, false);
 
   std::vector<llvm::StringRef> InvalidPaths =
-      SharedCache.getInvalidNegativeStatCachedPaths(*InMemoryFS.get());
+      SharedCache.getInvalidNegativeStatCachedPaths(*InMemoryFS);
 
   EXPECT_EQ(InvalidPaths.size(), 1u);
   ASSERT_STREQ("/path1.suffix", InvalidPaths[0].str().c_str());