md/raid10: get rid of duplicated conditional expression
Variable 'first' is initialized to zero and updated to @rdev->raid_disk only if it is greater than 0. Thus condition '>= first' always implies '>= 0' so the latter is not needed. Signed-off-by: NNamhyung Kim <namhyung@gmail.com> Signed-off-by: NNeilBrown <neilb@suse.de>
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