Marginally faster nand_ecc.c

[Charles Manning]

Folks

Herewith a patch that speeds up nand_ecc.c slightly. This should speed it up 
to be the same as yaffs_ecc.c which runs approx 15% faster than regular 
nand_ecc.c in the tests I have done.

All we're doing is moving the masking to outside the loop so we only take the 
hit once.

-- CHarles


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