Null-check after pointer dereference in multiple tiling functions

[longxin9715]

Description

Static analysis reports that several OP_TILING_CHECK null-pointer checks are executed after the pointer has already been dereferenced. This makes the check ineffective and may lead to a crash if the pointer is actually nullptr.

Affected Pointers & Locations

csrc\deepep\ops\op_host\moe_distribute_dispatch_v2_tiling.cpp

Pointer Variable	Dereference Location	Null-Check Location
epWorldSizePtr	CheckAndSetGroupInfo L449	Same function, after L449
sharedExpertRankNumPtr	CheckAndSetExpertInfo L509	Same function, after L509
moeExpertNumPtr	CheckAndSetExpertInfo L507	Same function, after L507
zeroExpertNumPtr	CheckAndSetSpecialExpertInfo L572	Same function, after L572
copyExpertNumPtr	CheckAndSetSpecialExpertInfo L573	Same function, after L573
constExpertNumPtr	CheckAndSetSpecialExpertInfo L574	Same function, after L574