[PATCH] msxml3: Fix uri object leak on error path (Valgrind).

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=45732

Your paranoid android.


=== debian9 (64 bit WoW report) ===

msxml3:
Unhandled exception: page fault on execute access to 0x0003b470 in 64-bit code (0x000000000003b470).