kernelbase: Reset last error on success in CopyFileExW().

dlls/kernel32/tests/file.c

@@ -899,8 +899,15 @@ static void test_CopyFileW(void)
     ok(!ret && GetLastError() == ERROR_FILE_EXISTS,
        "CopyFileW: unexpected error %ld\n", GetLastError());
 
+    SetLastError(0xdeadbeef);
     ret = CopyFileW(source, dest, FALSE);
     ok(ret, "CopyFileW: error %ld\n", GetLastError());
+    ok(GetLastError() == ERROR_SUCCESS, "Unexpected error %lu.\n", GetLastError());
+
+    SetLastError(0xdeadbeef);
+    ret = CopyFileExW(source, dest, NULL, NULL, NULL,  0 );
+    ok(ret, "CopyFileExW: error %ld\n", GetLastError());
+    ok(GetLastError() == ERROR_SUCCESS, "Unexpected error %lu.\n", GetLastError());
 
     ret = DeleteFileW(source);
     ok(ret, "DeleteFileW: error %ld\n", GetLastError());

dlls/kernelbase/file.c

@@ -588,6 +588,7 @@ done:
     HeapFree( GetProcessHeap(), 0, buffer );
     CloseHandle( h1 );
     CloseHandle( h2 );
+    if (ret) SetLastError( 0 );
     return ret;
 }
 

dlls/msvcp140/tests/msvcp140.c

@@ -1619,7 +1619,7 @@ static void test_Copy_file(void)
     SetLastError(0xdeadbeef);
     ret = p_Copy_file(L"wine_test_dir/f1", L"wine_test_dir/f3");
     ok(ret == ERROR_SUCCESS, "Got unexpected ret %lu.\n", ret);
-    todo_wine ok(GetLastError() == ret, "Got unexpected err %lu.\n", GetLastError());
+    ok(GetLastError() == ret, "Got unexpected err %lu.\n", GetLastError());
 
     SetLastError(0xdeadbeef);
     ret = p_Copy_file(L"wine_test_dir/missing", L"wine_test_dir/f3");