btrfs: open code extent_set_compress_type helpers

The helpers extent_set_compress_type and extent_compress_type have
become trivial after previous cleanups and can be removed.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -2562,7 +2562,7 @@ static struct io_failure_record *btrfs_get_io_failure_record(struct inode *inode
 	logical = em->block_start + logical;
 	if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
 		logical = em->block_start;
-		extent_set_compress_type(&failrec->bio_flags, em->compress_type);
+		failrec->bio_flags = em->compress_type;
 	}
 
 	btrfs_debug(fs_info,
@@ -3681,10 +3681,8 @@ static int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
 		BUG_ON(extent_map_end(em) <= cur);
 		BUG_ON(end < cur);
 
-		if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
-			extent_set_compress_type(&this_bio_flag,
-						 em->compress_type);
-		}
+		if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
+			this_bio_flag = em->compress_type;
 
 		iosize = min(extent_map_end(em) - cur, end - cur + 1);
 		cur_end = min(extent_map_end(em) - 1, end);

fs/btrfs/extent_io.h

@@ -140,17 +140,6 @@ static inline void extent_changeset_free(struct extent_changeset *changeset)
 	kfree(changeset);
 }
 
-static inline void extent_set_compress_type(unsigned long *bio_flags,
-					    int compress_type)
-{
-	*bio_flags = compress_type;
-}
-
-static inline int extent_compress_type(unsigned long bio_flags)
-{
-	return bio_flags;
-}
-
 struct extent_map_tree;
 
 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,