Fix a bug with df on large (>1TB) nfsv3 file servers on 32 bit client machines where the 'long' number of blocks in struct statfs wont fit. Instead of chosing an artificial 512 byte block size, simply scale it up until we avoid an overflow.  NFSv3 reports the sizes in bytes, and the blocksize is a figment of nfsclient's imagination.
Fix a bug with df on large (>1TB) nfsv3 file servers on 32 bit client
machines where the 'long' number of blocks in struct statfs wont fit.
Instead of chosing an artificial 512 byte block size, simply scale it up
until we avoid an overflow.  NFSv3 reports the sizes in bytes, and the
blocksize is a figment of nfsclient's imagination.

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