xfs_repair: remove various libxfs_device_to_fd calls

xfs_repair: remove various libxfs_device_to_fd calls

A few places in xfs_repair call libxfs_device_to_fd to get the data
device fd from the data device dev_t stored in the libxfs_init
structure.  Just use the file descriptor stored right there directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>