[PATCH 4.10 086/129] USB: serial: sierra: fix bogus alternate-setting assumption

4.10-stable review patch. If anyone has any objections, please let me know. -- From: Johan Hovold commit 16620b483eaf7750413bae472f4363b6b959fcaa upstream. Interface numbers do not change when enabling alternate settings as comment and code in this driver

[PATCH 4.10 086/129] USB: serial: sierra: fix bogus alternate-setting assumption

4.10-stable review patch. If anyone has any objections, please let me know. -- From: Johan Hovold commit 16620b483eaf7750413bae472f4363b6b959fcaa upstream. Interface numbers do not change when enabling alternate settings as comment and code in this driver suggested. Remove