Fix readlink smoke test

lib/std/os/test.zig

@@ -87,7 +87,7 @@ test "readlink" {
         var buffer: [fs.MAX_PATH_BYTES]u8 = undefined;
         const given = try os.readlink(symlink_path, buffer[0..]);
         std.debug.warn("given={}\n", .{given});
-        expect(mem.eql(u8, symlink_path, given));
+        expect(mem.eql(u8, target_path, given));
     }
 }