btrfs: reada: Fix a debug code typo

Remove one copy of loop to fix the typo of iterate zones.
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/reada.c

@@ -889,10 +889,6 @@ static void dump_devs(struct btrfs_fs_info *fs_info, int all)
 			re->logical, fs_info->tree_root->nodesize,
 			list_empty(&re->extctl),
 			re->scheduled_for ? re->scheduled_for->devid : -1);
-		for (i = 0; i < re->nzones; ++i) {
-			printk(KERN_CONT " zone %llu-%llu devs",
-				re->zones[i]->start,
-				re->zones[i]->end);
 		for (i = 0; i < re->nzones; ++i) {
 			printk(KERN_CONT " zone %llu-%llu devs",
 				re->zones[i]->start,
@@ -902,7 +898,6 @@ static void dump_devs(struct btrfs_fs_info *fs_info, int all)
 				       re->zones[i]->devs[j]->devid);
 			}
 		}
-		}
 		printk(KERN_CONT "\n");
 		index = (re->logical >> PAGE_CACHE_SHIFT) + 1;
 	}