[PATCH] user32: Fix some leaks on error path (Coverity).

[Marvin]

Hi,

While running your changed tests, 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=53122

Your paranoid android.


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

user32:
win.c:10131: Test failed: GetActiveWindow() = 00000000
win.c:10131: Test failed: GetFocus() = 00000000
win.c:10133: Test failed: Expected foreground window 000E0120, got 00E300D4
win.c:10136: Test failed: Received WM_ACTIVATEAPP(0), did not expect it.
win.c:10143: Test failed: Expected foreground window 000E0120, got 00000000
win.c:10145: Test failed: GetActiveWindow() = 00000000
win.c:10145: Test failed: GetFocus() = 00000000
win.c:10150: Test failed: Expected foreground window 000E0120, got 00E300D4
win.c:10153: Test failed: Received WM_ACTIVATEAPP(1), did not expect it.