xfs: refactor the btree cursor allocation logic in xchk_ag_btcur_init

Change xchk_ag_btcur_init to allocate all cursors first and only then
check if we should delete them again because the btree is to damaged.

This allows reusing the sick_mask in struct xfs_btree_ops and simplifies
the code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
diff --git a/fs/xfs/scrub/health.h b/fs/xfs/scrub/health.h
index 06d1794..63fc426 100644
--- a/fs/xfs/scrub/health.h
+++ b/fs/xfs/scrub/health.h
@@ -8,8 +8,8 @@
 
 unsigned int xchk_health_mask_for_scrub_type(__u32 scrub_type);
 void xchk_update_health(struct xfs_scrub *sc);
-bool xchk_ag_btree_healthy_enough(struct xfs_scrub *sc, struct xfs_perag *pag,
-		xfs_btnum_t btnum);
+void xchk_ag_btree_del_cursor_if_sick(struct xfs_scrub *sc,
+		struct xfs_btree_cur **curp, unsigned int sm_type);
 void xchk_mark_healthy_if_clean(struct xfs_scrub *sc, unsigned int mask);
 bool xchk_file_looks_zapped(struct xfs_scrub *sc, unsigned int mask);
 int xchk_health_record(struct xfs_scrub *sc);