net/http: remove redundant port validation
The URL port is already checked in net/url, so we can remove the redundant validation in net/http.
Fixes #33600
Change-Id: I62511a452df6262d4b66180933758d34627ff9df
GitHub-Last-Rev:
c19afa31025fee68ba0601bb75e9e20e09a36822
GitHub-Pull-Request: golang/go#33611
Reviewed-on: https://go-review.googlesource.com/c/go/+/190057
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>