internal/poll: fix the verbose condition in splice
internal/poll: fix the verbose condition in splice

Change-Id: I0b433ea1a78632de20ea58c48c9be0f1fb6eb083
Reviewed-on: https://go-review.googlesource.com/c/go/+/271499
Reviewed-by: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Trust: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>

nawawi/go,nawawi/go,golang/go,golang/go,golang/go,CAFxX/go,CAFxX/go,nawawi/go,CAFxX/go,golang/go,CAFxX/go,nawawi/go,golang/go,cloudflare/go,nawawi/go,cloudflare/go,CAFxX/go,cloudflare/go,cloudflare/go,cloudflare/go,nawawi/go,golang/go,cloudflare/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,golang/go,CAFxX/go,nawawi/go