tiff/lzw: sync (again) to the upstream lzw in the stdlib.

I somehow missed this in the previous change. Not sure how.

Change-Id: Ib9277944418a73cda6acc07fc308d846b4064b9e
Reviewed-on: https://go-review.googlesource.com/11321
Reviewed-by: Nigel Tao <[email protected]>

 tiff/lzw/reader.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tiff/lzw/reader.go b/tiff/lzw/reader.go
index 371adb0..033732c 100644
--- a/tiff/lzw/reader.go
+++ b/tiff/lzw/reader.go
@@ -228,7 +228,7 @@ func (d *decoder) flush() {
 	d.o = 0
 }
 
-var errClosed = errors.New("compress/lzw: reader/writer is closed")
+var errClosed = errors.New("lzw: reader/writer is closed")
 
 func (d *decoder) Close() error {
 	d.err = errClosed // in case any Reads come along