CPUUsage: don't hang on weird host

Try fixing CI of FreeBSD

src/detection/cpuusage/cpuusage.c

@@ -27,6 +27,7 @@ const char* ffGetCpuUsageResult(FFlist* result)
     if(cpuTimes1.length == 0) return "No CPU cores found";
 
     FF_LIST_AUTO_DESTROY cpuTimes2 = ffListCreate(sizeof(FFCpuUsageInfo));
+    uint32_t retryCount = 0;
 
 retry:
     error = ffGetCpuUsageInfo(&cpuTimes2);
@@ -41,6 +42,8 @@ retry:
         {
             ffListClear(&cpuTimes2);
             ffTimeSleep(200);
+            if (++retryCount >= 10)
+                return "Retry count exceeded";
             goto retry;
         }
     }