[PATCH] btrfs-progs: check/original: Remove unused variable first_key

[Qu Wenruo <wqu@suse.com>]

This @first_key variable is introduced in f5c4c4f3b75b
("btrfsck: add code to rebuild extent records"), however it's not only
unused, but also used incorrectly.

It's calling btrfs_item_key_to_cpu() on an node extent buffer.

Anyway, just remove it.

Fixes: f5c4c4f3b75b ("btrfsck: add code to rebuild extent records")
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 check/main.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/check/main.c b/check/main.c
index b476e07ba9e7..891a6d797756 100644
--- a/check/main.c
+++ b/check/main.c
@@ -6103,12 +6103,7 @@ static int run_next_block(struct btrfs_root *root,
 		}
 	} else {
 		int level;
-		struct btrfs_key first_key;
 
-		first_key.objectid = 0;
-
-		if (nritems > 0)
-			btrfs_item_key_to_cpu(buf, &first_key, 0);
 		level = btrfs_header_level(buf);
 		for (i = 0; i < nritems; i++) {
 			struct extent_record tmpl;
-- 
2.16.2