[PATCH 2/3] btrfs-progs: fix max mirror number error for chunk-recover

[Gui Hecheng <guihc.fnst@cn.fujitsu.com>]

When run chunk-recover on a health btrfs(data profile raid0, with
plenty of data), the program has a chance to abort on the number
of mirrors of an extent.

According to the kernel code, the max mirror number of an extent
is 3 not 2:
	ctree.h: 		BTRFS_MAX_MIRRORS	3
	chunk-recover.c :	BTRFS_NUM_MIRRORS	2
just change BTRFS_NUM_MIRRORS to 3, and everything goes well.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
---
 chunk-recover.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chunk-recover.c b/chunk-recover.c
index 9b46b0b..d5a688e 100644
--- a/chunk-recover.c
+++ b/chunk-recover.c
@@ -42,7 +42,7 @@
 #include "btrfsck.h"
 #include "commands.h"
 
-#define BTRFS_NUM_MIRRORS			2
+#define BTRFS_NUM_MIRRORS			3
 
 struct recover_control {
 	int verbose;
-- 
1.8.1.4