[PATCH] msxml3: Null check new child in insertBefore.

[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=91041

Your paranoid android.

=== debiant2 (32 bit report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (32 bit Arabic:Morocco report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (32 bit French report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (32 bit Hebrew:Israel report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (32 bit Hindi:India report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (32 bit Japanese:Japan report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (32 bit Chinese:China report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (32 bit WoW report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 00000000

=== debiant2 (64 bit WoW report) ===

msxml3:
domdoc.c:9295: Test failed: got 0x80004005
domdoc.c:9296: Test failed: got 0000000000000000