Fix recursive KM_USER1 usage in btrfs_realloc_node

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f7907b0..030d21d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -557,14 +557,9 @@
 		sizeof(struct btrfs_key_ptr) * nr;
 }
 
-static inline void btrfs_node_key(struct extent_buffer *eb,
-			   struct btrfs_disk_key *disk_key, int nr)
-{
-	unsigned long ptr;
-	ptr = btrfs_node_key_ptr_offset(nr);
-	read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
-		       struct btrfs_key_ptr, key, disk_key);
-}
+void btrfs_node_key(struct extent_buffer *eb,
+		    struct btrfs_disk_key *disk_key, int nr);
+
 static inline void btrfs_set_node_key(struct extent_buffer *eb,
 				      struct btrfs_disk_key *disk_key, int nr)
 {