net/http: connReader.bgErr is read but never set

[mvdan]

bgErr in connReader (server.go line 626) is read in line 735, but it's never assigned to.

Do we want to write to it in the handleReadError method, or should we get rid of the field and the dead code? (I assume the former, but opening an issue just in case)

Found via https://github.com/mvdan/unparam, which noticed that the handleReadError is unused.

CC @bradfitz

[bradfitz]

Haven't looked into it, but I assume we should just delete unused things.

[gopherbot]

CL https://golang.org/cl/42370 mentions this issue.