btrfs: Use list_empty instead of list_empty_careful

list_empty_careful usually is a signal of something tricky going on. Its
usage in btrfs is actually not needed since both lists it's used on are
local to a function and cannot be modified concurrently. So switch to
plain list_empty. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -10254,7 +10254,7 @@ static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput,
 		btrfs_wait_and_free_delalloc_work(work);
 	}
 
-	if (!list_empty_careful(&splice)) {
+	if (!list_empty(&splice)) {
 		spin_lock(&root->delalloc_lock);
 		list_splice_tail(&splice, &root->delalloc_inodes);
 		spin_unlock(&root->delalloc_lock);
@@ -10316,7 +10316,7 @@ int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
 
 	ret = 0;
 out:
-	if (!list_empty_careful(&splice)) {
+	if (!list_empty(&splice)) {
 		spin_lock(&fs_info->delalloc_root_lock);
 		list_splice_tail(&splice, &fs_info->delalloc_roots);
 		spin_unlock(&fs_info->delalloc_root_lock);