btrfs-progs: remove stale debugging prints in comments

CodeQL reports some commented out code which is from csum switch feature
development times. Remove one and make the other a proper comment.

Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

kernel-shared/disk-io.c

@@ -194,7 +194,7 @@ static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
 
 	if (verify) {
 		if (buf->fs_info && buf->fs_info->skip_csum_check) {
-			/* printf("skip csum check for block %llu\n", buf->start); */
+			/* Skip csum check for block buf->start. */
 		} else if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
 			if (!silent) {
 				char found[BTRFS_CSUM_STRING_LEN];

kernel-shared/file-item.c

@@ -203,7 +203,6 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans, u64 logical,
 	if (ret == -EFBIG) {
 		u32 item_size;
 
-		/* printf("item not big enough for bytenr %llu\n", bytenr); */
 		/* we found one, but it isn't big enough yet */
 		leaf = path->nodes[0];
 		item_size = btrfs_item_size(leaf, path->slots[0]);