more int return value cleanup for blkdev.h helpers

[Christoph Hellwig <hch@xxxxxx>]

Hi Jens,

as John pointed out there are a bunch more helpers in blkdev.h
that return int when the underlying value should be unsigned int.
Thid series fixes those, and also switches those that return boolean
values to bool and drop a duplicate prototype.

Diffstat:
 blkdev.h |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)