Fix Incorrect Usage of MemoryBuffer in XFS AllocationGroup
Fix Incorrect Usage of MemoryBuffer in XFS AllocationGroup

The AllocationGroup code in XFS initializes a MemoryBuffer
via MemoryBuffer.create and then uses the local variable
pointing to the buffer for the data read from the XFS filesystem,
discarding the newly allocated buffer.

We now read the data directly without allocating the MemoryBuffer
so space is not wasted.

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