net/http: fix SetKeepAlivesEnabled receiver name

This makes the receiver name consistent with the rest of the methods on
type Server.

Change-Id: Ic2a007d3b5eb50bd87030e15405e9856109cf590
Reviewed-on: https://go-review.googlesource.com/13035Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/server.go

@@ -1884,11 +1884,11 @@ func (s *Server) doKeepAlives() bool {
 // By default, keep-alives are always enabled. Only very
 // resource-constrained environments or servers in the process of
 // shutting down should disable them.
-func (s *Server) SetKeepAlivesEnabled(v bool) {
+func (srv *Server) SetKeepAlivesEnabled(v bool) {
 	if v {
-		atomic.StoreInt32(&s.disableKeepAlives, 0)
+		atomic.StoreInt32(&srv.disableKeepAlives, 0)
 	} else {
-		atomic.StoreInt32(&s.disableKeepAlives, 1)
+		atomic.StoreInt32(&srv.disableKeepAlives, 1)
 	}
 }