[PATCH] user32: Fix a memory leak.

[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=46089

Your paranoid android.


=== debian9 (32 bit report) ===

user32:
msg.c:8713: Test failed: WaitForSingleObject failed 102
msg.c:8719: Test failed: destroy child on thread exit: 0: the msg 0x0082 was expected, but got msg 0x000f instead
msg.c:8719: Test failed: destroy child on thread exit: 1: the msg 0x000f was expected, but got msg 0x0014 instead
msg.c:8719: Test failed: destroy child on thread exit: 2: the msg sequence is not complete: expected 0014 - actual 0000

=== debian9 (32 bit Chinese:China report) ===

user32:
msg.c:8713: Test failed: WaitForSingleObject failed 102
msg.c:8719: Test failed: destroy child on thread exit: 0: the msg 0x0082 was expected, but got msg 0x000f instead
msg.c:8719: Test failed: destroy child on thread exit: 1: the msg 0x000f was expected, but got msg 0x0014 instead
msg.c:8719: Test failed: destroy child on thread exit: 2: the msg sequence is not complete: expected 0014 - actual 0000

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

user32:
clipboard.c:330: Test failed: OpenClipboard error 5
clipboard.c:77: Test failed: 331: SetClipboardData failed
clipboard.c:79: Test failed: 331: SetClipboardData failed err 1418
clipboard.c:332: Test failed: CF_WAVE not available
clipboard.c:333: Test failed: CF_WAVE data not available
clipboard.c:107: Test failed: process 3: CF_WAVE not available
clipboard.c:109: Test failed: process 3: SetClipboardData failed err 1418
clipboard.c:336: Test failed: CloseClipboard error 1418