GFS2: Block alloc fixes

[Steven Whitehouse]

These three patches fix a couple of bugs in the block allocation
code that was updated at the merge window. Thanks are due to
Benny Halevy, Christoph Lameter and Willy Tarreau for looking
at the __ffs64 patch. I've updated the comment in that patch
in the light of Willy Tarreau's suggestion,

Steve.


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