[PATCH 4.4 61/72] md/raid10: reset the first at the end of loop

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Guoqing Jiang commit 6f287ca6046edd34ed83aafb7f9033c9c2e809e2 upstream. We need to set "first = 0' at the end of rdev_for_each loop, so we can get the array's min_offset_diff

[PATCH 4.4 61/72] md/raid10: reset the first at the end of loop

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Guoqing Jiang commit 6f287ca6046edd34ed83aafb7f9033c9c2e809e2 upstream. We need to set "first = 0' at the end of rdev_for_each loop, so we can get the array's min_offset_diff correctly