xfs: cleanup duplicate initializations

follow these guidelines:
- leave initialization in the declaration block if it fits the line
- move to the code where it's more suitable ('for' init block)

The last chunk was modified from David's original to be a correct
fix for what appeared to be a duplicate initialization.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

fs/xfs/xfs_dfrag.c

@@ -202,7 +202,7 @@ xfs_swap_extents(
 	xfs_inode_t	*tip,	/* tmp inode */
 	xfs_swapext_t	*sxp)
 {
-	xfs_mount_t	*mp;
+	xfs_mount_t	*mp = ip->i_mount;
 	xfs_trans_t	*tp;
 	xfs_bstat_t	*sbp = &sxp->sx_stat;
 	xfs_ifork_t	*tempifp, *ifp, *tifp;
@@ -212,16 +212,12 @@ xfs_swap_extents(
 	int		taforkblks = 0;
 	__uint64_t	tmp;
 
-	mp = ip->i_mount;
-
 	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
 	if (!tempifp) {
 		error = XFS_ERROR(ENOMEM);
 		goto out;
 	}
 
-	sbp = &sxp->sx_stat;
-
 	/*
 	 * we have to do two separate lock calls here to keep lockdep
 	 * happy. If we try to get all the locks in one call, lock will

fs/xfs/xfs_inode_item.c

@@ -970,7 +970,6 @@ xfs_iflush_abort(
 {
 	xfs_inode_log_item_t	*iip = ip->i_itemp;
 
-	iip = ip->i_itemp;
 	if (iip) {
 		struct xfs_ail	*ailp = iip->ili_item.li_ailp;
 		if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {

fs/xfs/xfs_mount.c

@@ -1900,7 +1900,7 @@ xfs_mod_incore_sb_batch(
 	uint			nmsb,
 	int			rsvd)
 {
-	xfs_mod_sb_t		*msbp = &msb[0];
+	xfs_mod_sb_t		*msbp;
 	int			error = 0;
 
 	/*
@@ -1910,7 +1910,7 @@ xfs_mod_incore_sb_batch(
 	 * changes will be atomic.
 	 */
 	spin_lock(&mp->m_sb_lock);
-	for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
+	for (msbp = msb; msbp < (msb + nmsb); msbp++) {
 		ASSERT(msbp->msb_field < XFS_SBS_ICOUNT ||
 		       msbp->msb_field > XFS_SBS_FDBLOCKS);