acrntrace: break when finding the matching key

The key in the list is unique. So, it is better to break the loop
when find the matching key instead of traversing the whole list.

Tracked-On: #4175
Acked-by: Yan, Like <like.yan@intel.com>
Signed-off-by: Kaige Fu <kaige.fu@intel.com>

misc/tools/acrntrace/scripts/vmexit_analyze.py

@@ -137,6 +137,7 @@ def parse_trace_data(ifile):
                     if event == LIST_EVENTS.get(key):
                         NR_EXITS[key] += 1
                         last_ev_id = key
+                        break
 
                     else:
                         # Skip the non-VMEXIT trace event