shell32: Avoid leaks and add parameter checks in SHCreateShellFolderView[Ex]. (try 2)

[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://newtestbot.winehq.org/JobDetails.pl?Key=2885

Your paranoid android.


=== w864 (64 bit shlfolder) ===
shlfolder: unhandled exception c0000005 at 000007F851EBABDC