lint: enable nakedret (#7569)

Replace naked returns with explicit return values to satisfy nakedret
linter and improve readability.

Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>

plugin/loadbalance/loadbalance_test.go

@@ -192,7 +192,7 @@ func countRecords(result []dns.RR) (cname int, address int, mx int, sorted bool)
 			state = Any
 		}
 	}
-	return
+	return cname, address, mx, sorted
 }
 
 func handler() plugin.Handler {