btrfs-progs: cache csum_type in recover_control

Cache the super-block's checksum type field in 'struct recover_control'.
This will be needed for further refactoring the checksum handling.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: Johannes Thumshirn

cmds/rescue-chunk-recover.c

@@ -47,6 +47,7 @@ struct recover_control {
 	int yes;
 
 	u16 csum_size;
+	u16 csum_type;
 	u32 sectorsize;
 	u32 nodesize;
 	u64 generation;
@@ -1530,6 +1531,7 @@ static int recover_prepare(struct recover_control *rc, const char *path)
 	rc->generation = btrfs_super_generation(sb);
 	rc->chunk_root_generation = btrfs_super_chunk_root_generation(sb);
 	rc->csum_size = btrfs_super_csum_size(sb);
+	rc->csum_type = btrfs_super_csum_type(sb);
 
 	/* if seed, the result of scanning below will be partial */
 	if (btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_SEEDING) {