encoding/gob: remove unused ut and atyp parameters
encoding/gob: remove unused ut and atyp parameters

Found by github.com/mvdan/unparam.

Change-Id: Ic97f05a2ecb5b17caa36aafe403e2266abea3e0e
Reviewed-on: https://go-review.googlesource.com/37836
Run-TryBot: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

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