[PATCH] shell32: fix two bugs in IQueryAssocations

[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=20226

Your paranoid android.


=== wvistau64 (32 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w2008s64 (32 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w7u (32 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w7pro64 (32 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w8 (32 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w864 (32 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w1064 (32 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== wvistau64 (64 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w2008s64 (64 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w7pro64 (64 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w864 (64 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a

=== w1064 (64 bit assoc) ===
assoc.c:136: Test failed: 2: GetString failed, 0x8007007a