shlwapi/url: Keep pointer to allocated block to free it later (Valgrind)

[Nikolay Sivov]

There's a place where destination pointer is altered:

---
     if(needed + len <= *pcchEscaped) {
         memcpy(dst, next, len*sizeof(WCHAR));
         dst += len;
     }
---

after this it's used to free a buffer.
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