testing: delete unused stopAlarm()
testing: delete unused stopAlarm()

The function call was removed in:
ead08e91f6468ab1c35c250ec487935103c580f6

Change-Id: I78fe563c9ea4554811c74130533d2186a65d3033
Reviewed-on: https://go-review.googlesource.com/35532
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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