Restart video when mode detection is failed

KVM sometimes stops when video mode is changed. This commit adds
video restarting logic for the case.

Tested:
  1. Open BMCWeb -> Server control -> KVM
  2. Checked KVM screen update while restarting the host. It
     updates all frames even when video mode changes happen.

Change-Id: If986394110986e49a6eaac1ae2859208fa7681f5
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
diff --git a/ikvm_video.cpp b/ikvm_video.cpp
index ed5ed92..0274967 100644
--- a/ikvm_video.cpp
+++ b/ikvm_video.cpp
@@ -155,6 +155,7 @@
     {
         log<level::ERR>("Failed to query timings",
                         entry("ERROR=%s", strerror(errno)));
+        restart();
         return false;
     }