btrfs: drop error message in extent_io_tree insert_state()

The helper insert_state errors are handled in all callers and reported
by extent_io_tree_panic so we don't need to do it twice.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-io-tree.c

@@ -442,9 +442,6 @@ static struct extent_state *insert_state(struct extent_io_tree *tree,
 			}
 			node = &(*node)->rb_right;
 		} else {
-			btrfs_err(tree->fs_info,
-			       "found node %llu %llu on insert of %llu %llu",
-			       entry->start, entry->end, state->start, state->end);
 			return ERR_PTR(-EEXIST);
 		}
 	}