chore: linter: errorlint

Signed-off-by: Jakob Borg <jakob@kastelo.net>

lib/connections/util.go

@@ -7,6 +7,7 @@
 package connections
 
 import (
+	"errors"
 	"net"
 	"net/url"
 	"strconv"
@@ -20,7 +21,8 @@ func fixupPort(uri *url.URL, defaultPort int) *url.URL {
 	copyURI := *uri
 
 	host, port, err := net.SplitHostPort(uri.Host)
-	if e, ok := err.(*net.AddrError); ok && strings.Contains(e.Err, "missing port") {
+	e := &net.AddrError{}
+	if errors.As(err, &e) && strings.Contains(e.Err, "missing port") {
 		// addr is of the form "1.2.3.4" or "[fe80::1]"
 		host = uri.Host
 		if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {