[patch] pthread_setschedparam.3: Invalid free() in example code

[Simon Newton <nomis52@xxxxxxxxx>]

The example program will crash if -A is used, since attr is uninitialized.

$ ./a.out  -A
*** Error in `./a.out': free(): invalid pointer: 0xb779c3c4 ***
Aborted (core dumped)



diff --git a/man3/pthread_setschedparam.3 b/man3/pthread_setschedparam.3
index 971bc0c..36b00bd 100644
--- a/man3/pthread_setschedparam.3
+++ b/man3/pthread_setschedparam.3
@@ -424,9 +424,11 @@ main(int argc, char *argv[])

     /* Destroy unneeded thread attributes object */

-    s = pthread_attr_destroy(&attr);
-    if (s != 0)
-        handle_error_en(s, "pthread_attr_destroy");
+    if (!use_null_attrib) {
+      s = pthread_attr_destroy(&attr);
+      if (s != 0)
+          handle_error_en(s, "pthread_attr_destroy");
+    }

     s = pthread_join(thread, NULL);
     if (s != 0)
--
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