misc: clean up code around attr_list_by_handle calls

Reduce stack usage of the attr_list_by_handle calls by allocating the
buffers dynamically.  Remove some redundant bits while we're at it.

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