xfs: fix the xfs_log_iovec i_addr type

By making this member a void pointer we can get rid of a lot of pointless
casts.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --cc fs/xfs/quota/xfs_dquot_item.c
Simple merge

diff --cc fs/xfs/xfs_buf_item.c
Simple merge

diff --cc fs/xfs/xfs_extfree_item.c
Simple merge

diff --cc fs/xfs/xfs_inode_item.c
Simple merge

diff --cc fs/xfs/xfs_log.c
Simple merge

diff --cc fs/xfs/xfs_log.h
Simple merge

diff --cc fs/xfs/xfs_log_cil.c
Simple merge

diff --cc fs/xfs/xfs_log_recover.c
Simple merge