MdeModulePkg/DxeCore: Add comments for the ASSERT to check NULL ptr
MdeModulePkg/DxeCore: Add comments for the ASSERT to check NULL ptr

Commit 8932679df5be046feba30fae80776c5815232a08 adds an ASSERT for
checking NULL pointer dereference.

The ASSERT added here is for addressing a false positive NULL pointer
dereference issue raised from static analysis.

This commit adds comments to clarify the reason for using ASSERT as the
check.

Cc: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Cc: Michael D Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>
Reviewed-by: Jiewen Yao <364a90bfebd1f362ebb7b48e4bf8ec010adef203@intel.com>

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