[PATCH 4.9 23/25] ipmi: fix unsigned long underflow

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Corey Minyard commit 392a17b10ec4320d3c0e96e2a23ebaad1123b989 upstream. When I set the timeout to a specific value such as 500ms, the timeout event will not happen in time

[PATCH 4.9 23/25] ipmi: fix unsigned long underflow

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Corey Minyard commit 392a17b10ec4320d3c0e96e2a23ebaad1123b989 upstream. When I set the timeout to a specific value such as 500ms, the timeout event will not happen in time due to the overflow