btrfs: call btrfs_try_granting_tickets when unpinning anything

When unpinning we were only calling btrfs_try_granting_tickets() if
global_rsv->space_info == space_info, which is problematic because we
use ticketing for SYSTEM chunks, and want to use it for DATA as well.
Fix this by moving this call outside of that if statement.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

@@ -2849,11 +2849,10 @@ static int unpin_extent_range(struct btrfs_fs_info *fs_info,
 				len -= to_add;
 			}
 			spin_unlock(&global_rsv->lock);
-			/* Add to any tickets we may have */
-			if (len)
-				btrfs_try_granting_tickets(fs_info,
-							   space_info);
 		}
+		/* Add to any tickets we may have */
+		if (!readonly && return_free_space && len)
+			btrfs_try_granting_tickets(fs_info, space_info);
 		spin_unlock(&space_info->lock);
 	}