xfs: refactor btree block header checking functions

xfs: refactor btree block header checking functions

Source kernel commit: 52c732eee78b47ac2eb828b1c7fa611cd37b0090

Refactor the btree block header checks to have an internal function that
returns the address of the failing check without logging errors.  The
scrubber will call the internal function, while the external version
will maintain the current logging behavior.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>