If the "next free cluster" field of the FSInfo block is 0xFFFFFFFF, it means that the correct value is unknown. Since this value is just a hint to improve performance, initially assume that the first non-reserved cluster is free, then correct this assumption if necessary before writing the FSInfo block back to disk.
If the "next free cluster" field of the FSInfo block is 0xFFFFFFFF,
it means that the correct value is unknown. Since this value is just
a hint to improve performance, initially assume that the first non-reserved
cluster is free, then correct this assumption if necessary before writing
the FSInfo block back to disk.

PR:		62826
MFC after:	2 weeks

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