fix crash in AtlInternalQueryInterface

[Stefan Leichter]

Hello,

the attached patch fixes a crash for the attached log

000b:Call atl.AtlInternalQueryInterface(41fb010c,35c51a4c,4177b8e0,00000001) 
ret=35c54e69
trace:atl:AtlInternalQueryInterface (0x41fb010c, 0x35c51a4c, 0x4177b8e0, 0x1)
trace:atl:AtlInternalQueryInterface Trying entry 0 (0x35c53240 192 0x1)
trace:atl:AtlInternalQueryInterface Trying entry 1 (0x35c529cc 196 0x1)
trace:atl:AtlInternalQueryInterface Trying entry 2 ((nil) 902250944 
0x35c56203)

ChangeLog
--------------
	Check for NULL before doing IsEqualGUID() in AtlInternalQueryInterface
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