[PATCH] rt-tests: cyclicdeadline: fix segmentation fault on close

[Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>]

The setcpu_buf is unconditionally freed at the end of the program. However,
there are code paths in which it is not allocated:

  $ sudo ./cyclicdeadline
  Using all CPUS
  /sys/kernel/debug/sched_features: Success
  interval: 600:1000
    Tested at 5us of 600us
  deadline thread 2963
  thread[2963] runtime=600us deadline=1000us
  main thread 2962
  fail 2 0
  T: 0 ( 2963) I:1000 C:   1268 Min:      7 Act:   55 Avg:   56 Max:     256
  [1]    2961 segmentation fault  sudo ./cyclicdeadline

Fix it by adding the NULL check.

Signed-off-by: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
---
 src/sched_deadline/cyclicdeadline.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/sched_deadline/cyclicdeadline.c b/src/sched_deadline/cyclicdeadline.c
index 08460107c464..614ad54c171f 100644
--- a/src/sched_deadline/cyclicdeadline.c
+++ b/src/sched_deadline/cyclicdeadline.c
@@ -1261,6 +1261,7 @@ int main (int argc, char **argv)
 		}
 	}
 
-	free(setcpu_buf);
+	if (setcpu_buf)
+		free(setcpu_buf);
 	return 0;
 }
-- 
2.11.0