Add error code handling to remove_all test

As mentioned by EricWF in revision D41830



git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@322351 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/experimental/filesystem/fs.op.funcs/fs.op.remove_all/remove_all.pass.cpp

@@ -83,7 +83,7 @@ TEST_CASE(test_error_reporting)
     for (auto &p : testCasesNonexistant) {
         std::error_code ec;
 
-        TEST_CHECK(fs::remove_all(p) == 0);
+        TEST_CHECK(fs::remove_all(p, ec) == 0);
         TEST_CHECK(!ec);
     }
 }