strings: Replace s[:] to s where s is a slice.
strings: Replace s[:] to s where s is a slice.

Change-Id: Ie7ba3f9ece9b0fc0e8a5c92fbae9c3b558815e4c
Reviewed-on: https://go-review.googlesource.com/c/141997
Run-TryBot: Iskander Sharipov <a698043bc2fd5ebc21d5b6bbc66ee53917362fef@intel.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Iskander Sharipov <a698043bc2fd5ebc21d5b6bbc66ee53917362fef@intel.com>

CAFxX/go,josharian/go,josharian/go,nawawi/go,akutz/go,CAFxX/go,nawawi/go,CAFxX/go,akutz/go,akutz/go,CAFxX/go,golang/go,CAFxX/go,golang/go,akutz/go,cloudflare/go,cloudflare/go,akutz/go,cloudflare/go,golang/go,CAFxX/go,josharian/go,josharian/go,akutz/go,golang/go,CAFxX/go,nawawi/go,golang/go,golang/go,nawawi/go,nawawi/go,akutz/go,cloudflare/go,nawawi/go,cloudflare/go,josharian/go,cloudflare/go,josharian/go,golang/go,nawawi/go,cloudflare/go,nawawi/go,cloudflare/go,josharian/go,CAFxX/go,golang/go,josharian/go,akutz/go