runtime: remove unused ratep parameter
runtime: remove unused ratep parameter

Found by github.com/mvdan/unparam.

Change-Id: Iabcdfec2ae42c735aa23210b7183080d750682ca
Reviewed-on: https://go-review.googlesource.com/38030
Reviewed-by: Peter Weinberger <dd140fb9530d791057dd8833ea6768ff65fcde71@google.com>
Run-TryBot: Peter Weinberger <dd140fb9530d791057dd8833ea6768ff65fcde71@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

polyverse-security/go,ImJasonH/go,ImJasonH/go,linux-on-ibm-z/go,CAFxX/go,vsekhar/elastic-go,golang/go,cloudflare/go,golang/go,linux-on-ibm-z/go,nawawi/go,golang/go,cloudflare/go,golang/go,Cofyc/go,Cofyc/go,polyverse-security/go,akutz/go,codestation/go,nawawi/go,derekmarcotte/go,CAFxX/go,codestation/go,nawawi/go,CAFxX/go,derekmarcotte/go,linux-on-ibm-z/go,polyverse-security/go,nawawi/go,nawawi/go,derekmarcotte/go,golang/go,codestation/go,polyverse-security/go,nawawi/go,CAFxX/go,Cofyc/go,vsekhar/elastic-go,nawawi/go,vsekhar/elastic-go,cloudflare/go,akutz/go,codestation/go,cloudflare/go,codestation/go,CAFxX/go,akutz/go,josharian/go,ImJasonH/go,cloudflare/go,golang/go,ImJasonH/go,polyverse-security/go,linux-on-ibm-z/go,ImJasonH/go,golang/go,vsekhar/elastic-go,derekmarcotte/go,ImJasonH/go,vsekhar/elastic-go,Cofyc/go,polyverse-security/go,CAFxX/go,akutz/go,akutz/go,christopher-henderson/Go,codestation/go,Cofyc/go,linux-on-ibm-z/go,derekmarcotte/go,josharian/go,CAFxX/go,ImJasonH/go,derekmarcotte/go,akutz/go,vsekhar/elastic-go,Cofyc/go,cloudflare/go,cloudflare/go,CAFxX/go,derekmarcotte/go,josharian/go,Cofyc/go,linux-on-ibm-z/go,akutz/go,golang/go,Cofyc/go,josharian/go,josharian/go,codestation/go,josharian/go,josharian/go,josharian/go,derekmarcotte/go,nawawi/go,vsekhar/elastic-go,linux-on-ibm-z/go,ImJasonH/go,polyverse-security/go,cloudflare/go,linux-on-ibm-z/go,codestation/go,vsekhar/elastic-go,akutz/go,polyverse-security/go