btrfs: remove a stale comment for btrfs_decompress_bio()

Since commit 8140dc30a432 ("btrfs: btrfs_decompress_bio() could accept
compressed_bio instead"), btrfs_decompress_bio() accepts
"struct compressed_bio" other than open-coded parameter list.

Thus the comments for the parameter list is no longer needed.

Reviewed-by: Anand Jain <[e-mail]>
Signed-off-by: Qu Wenruo <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/compression.c

···
 	return ret;
 }
 
-/*
- * pages_in is an array of pages with compressed data.
- *
- * disk_start is the starting logical offset of this array in the file
- *
- * orig_bio contains the pages from the file that we want to decompress into
- *
- * srclen is the number of bytes in pages_in
- *
- * The basic idea is that we have a bio that was created by readpages.
- * The pages in the bio are for the uncompressed data, and they may not
- * be contiguous.  They all correspond to the range of bytes covered by
- * the compressed extent.
- */
 static int btrfs_decompress_bio(struct compressed_bio *cb)
 {
 	struct list_head *workspace;