Two more memory leak fixes, on error paths I didn't spot in r9919.

[sgt/putty] / windows / website.url

[InternetShortcut]
URL=http://www.chiark.greenend.org.uk/~sgtatham/putty/
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0