stress-ng: fix rounding error in bogo ops-calculation

There is a somewhat non-intuitive operation if one specifies the
number of stressors and the number of bogo-ops on the command line
and the number of bogo-ops is less than the number of stressors.
The expectation in this case (#stressors > #bogo-ops) that one  would
effectively run one op on each stressor.  However, what happens is
the number of operations rounds to 0 and the test runs until the
timeout period is reached instead of the expected short test run time.

If we round up the bogo ops calculation, then we get 1 ops run in
this case which feels more like the expected behavior.

Signed-off-by: Rob Colclaser <[email protected]>
Signed-off-by: Colin Ian King <[email protected]>

stress-ng.c

@@ -3067,10 +3067,10 @@ int main(int argc, char **argv)
 				" second run per stressor\n", g_opt_timeout);
 		}
 
-		/* Share bogo ops between processes equally */
+		/* Share bogo ops between processes equally, rounding up if nonzero bogo_ops */
 		for (i = 0; i < STRESS_MAX; i++) {
 			procs[i].bogo_ops = procs[i].num_procs ?
-				procs[i].bogo_ops / procs[i].num_procs : 0;
+				(procs[i].bogo_ops + (procs[i].num_procs - 1)) / procs[i].num_procs : 0;
 			procs[i].pids = NULL;
 
 			if (max_procs < procs[i].num_procs)