btrfs: kill the key type accessor helpers

btrfs_set_key_type and btrfs_key_type are used inconsistently along with
open coded variants. Other members of btrfs_key are accessed directly
without any helpers anyway.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index af0359d..1009fa8 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4224,7 +4224,7 @@
 	WARN_ON(!ret);
 	path->slots[0]--;
 	btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
-	found_type = btrfs_key_type(&found_key);
+	found_type = found_key.type;
 
 	/* No extents, but there might be delalloc bits */
 	if (found_key.objectid != btrfs_ino(inode) ||