btrfs: combine extra if statements in btrfs_truncate_inode_items

We have

    if (del_item)
	    // do something
    else
	    // something else
    if (del_item)
	    // do yet another thing
    else
	    // something else entirely

back to back in btrfs_truncate_inode_items, collapse these two sets of
if statements into one.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode-item.c

@@ -646,14 +646,11 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 			}
 		}
 
-		if (del_item)
-			control->last_size = found_key.offset;
-		else
-			control->last_size = new_size;
 		if (del_item) {
 			ASSERT(!pending_del_nr ||
 			       ((path->slots[0] + 1) == pending_del_slot));
 
+			control->last_size = found_key.offset;
 			if (!pending_del_nr) {
 				/* No pending yet, add ourselves */
 				pending_del_slot = path->slots[0];
@@ -665,6 +662,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 				pending_del_slot = path->slots[0];
 			}
 		} else {
+			control->last_size = new_size;
 			break;
 		}
 		should_throttle = false;