ubi: fastmap: Remove unneeded break condition while filling pools

Change pool filling stop condition. Commit d09e9a2bddba ("ubi:
fastmap: Fix high cpu usage of ubi_bgt by making sure wl_pool
not empty") reserves fastmap data PEBs after filling 1 PEB in
wl_pool. Now wait_free_pebs_for_pool() makes enough free PEBs
before filling pool, there will still be at least 1 PEB in pool
and 1 PEB in wl_pool after doing ubi_refill_pools().

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/drivers/mtd/ubi/fastmap-wl.c b/drivers/mtd/ubi/fastmap-wl.c
index 1285471..7c4cfd8 100644
--- a/drivers/mtd/ubi/fastmap-wl.c
+++ b/drivers/mtd/ubi/fastmap-wl.c
@@ -142,8 +142,7 @@
  * @ubi: UBI device description object
  * This helper function checks whether there are enough free pebs (deducted
- * by fastmap pebs) to fill fm_pool and fm_wl_pool, above rule works after
- * there is at least one of free pebs is filled into fm_wl_pool.
+ * by fastmap pebs) to fill fm_pool and fm_wl_pool.
 static bool has_enough_free_count(struct ubi_device *ubi)
@@ -152,7 +151,7 @@
 	if (!ubi->free.rb_node)
 		return false;
-	if (ubi->fm_wl_pool.size > 0 && !(ubi->ro_mode || ubi->fm_disabled))
+	if (!ubi->ro_mode && !ubi->fm_disabled)
 		fm_used = ubi->fm_size / ubi->leb_size - 1;
 	return ubi->free_count > fm_used;