btrfs: remove nested duplicate variable declarations

Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 84d7ca1..c60197b 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -3647,7 +3647,6 @@
 
 	ret = 0;
 	if (slot == 0) {
-		struct btrfs_disk_key disk_key;
 		btrfs_cpu_key_to_disk(&disk_key, cpu_key);
 		ret = fixup_low_keys(trans, root, path, &disk_key, 1);
 	}
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 63731a1..9e69c6b 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1910,8 +1910,6 @@
 	while(1) {
 		if (entry->bytes < bytes ||
 		    (!entry->bitmap && entry->offset < min_start)) {
-			struct rb_node *node;
-
 			node = rb_next(&entry->offset_index);
 			if (!node)
 				break;
@@ -1925,7 +1923,6 @@
 						      cluster, entry, bytes,
 						      min_start);
 			if (ret == 0) {
-				struct rb_node *node;
 				node = rb_next(&entry->offset_index);
 				if (!node)
 					break;