misc/cgo/errors: remove debugging println

Change-Id: I0c7da31e94307f939e1a2f023e00d5b24bac0ea6
Reviewed-on: https://go-review.googlesource.com/c/go/+/179604
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

misc/cgo/errors/ptr_test.go

@@ -440,7 +440,6 @@ func TestPointerChecks(t *testing.T) {
 			atomic.AddInt32(&pending, +1)
 			defer func() {
 				if atomic.AddInt32(&pending, -1) == 0 {
-					println("removing", dir)
 					os.RemoveAll(dir)
 				}
 			}()