container/list: silence vet warnings
container/list: silence vet warnings

container/list/list_test.go:274: self-assignment of e1 to e1
container/list/list_test.go:274: self-assignment of e4 to e4
container/list/list_test.go:282: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e1 to e1
container/list/list_test.go:286: self-assignment of e4 to e4

Updates #11041

Change-Id: Ibd90cf6a924e93497908f437b814c3fc82937f4a
Reviewed-on: https://go-review.googlesource.com/27114
Run-TryBot: Josh Bleecher Snyder <cdc248cc4d32e4fbfe04e45228163bcecd48a0b9@gmail.com>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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