[RTEMS Project] #4329: main_rtrace.c: Dereference after null check error spotted by Coverity

[RTEMS trac]

#4329: main_rtrace.c: Dereference after null check error spotted by Coverity
------------------------+--------------------
  Reporter:  Ryan Long  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  normal     |  Milestone:  6.1
 Component:  lib        |    Version:  6
  Severity:  normal     |   Keywords:
Blocked By:             |   Blocking:
------------------------+--------------------
 CID 1399709: Dereference after null check in
 rtems_trace_buffering_shell_save().

 {{{
    6. var_compare_op: Comparing buf to null implies that buf might be
 null.
 472  if (!buf)
 473  {
 474    close (out);
 475    printf ("error: no memory\n");
 476  }
 477
    CID 1399709 (#1 of 1): Dereference after null check (FORWARD_NULL)7.
 var_deref_model: Passing null pointer buf to memset, which dereferences
 it.
 478  memset (buf, 0, SAVE_BUF_SIZE);
 }}}

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Ticket URL: <http://devel.rtems.org/ticket/4329>
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