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[FD] null pointer deference in mfmp4srcsnk.dll in latest windows 10

Found a null pointer deference in mfmp4srcsnk.dll in latest windows 10 by
accident.

Download mov file here:

https://github.com/MozillaSecurity/fuzzdata/blob/master/samples/samples.mplayerhq.hu/ffmpeg-bugs/roundup/issue2490/invalid_mov_time.mov

Your explorer will crash. If not use windows media player.

(2788.3588): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=180bced8 ecx=5aaa2e20 edx=44445111 esi=5aaa2e20
edi=00000000
eip=5aa7d16e esp=1793f374 ebp=1793f3b4 iopl=0         nv up ei pl zr na pe
cy
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010247
mfmp4srcsnk!CQTMovie::FinalParseAtom+0x16e:
5aa7d16e 8b08            mov     ecx,dword ptr [eax]
 ds:002b:00000000=????????

I know MSRC usually do not fix null pointer deference but I reported to
them just in case. And as I expected they closed the case.

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