Rollup merge of #64632 - guanqun:patch-1, r=jonas-schievink
Rollup merge of #64632 - guanqun:patch-1, r=jonas-schievink

remove the extra comma after the match arm

This would follow the same coding style as all the other match arms in this file.

graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust