[Bug 4320] MdePkg/Library/UefiLib: Coverity scan flags FORWARD_NULL issues



--- Comment #1 from Veeresh Sangolli <veeresh.sangolli@...> ---
Created attachment 1311
--> https://bugzilla.tianocore.org/attachment.cgi?id=1311&action=edit
Proposed patch to resolve the Forward_Null issue pointed by Coverity for MdePkg

The function ScanTableInSDT at its beginning does a NULL check on
PreviousTableLocated value and has ASSERT (PreviousTable != NULL);
in the if path and ASSERT (PreviousTable == NULL); in the else path.

Both these ASSERT are applicable only in the DEBUG mode and the code
still proceeds further after the if-else blocks and may lead to CRASH.

Hence, for safety add due blocking checks in if as well as else path.

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