10812 ctf tools shouldn't add blank labels
10813 ctf symbol mapping needs work
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 8,18 ****
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright 2015 Joyent, Inc.
   */
  
  /*
   * Main conversion entry points. This has been designed such that there can be
   * any number of different conversion backends. Currently we only have one that
--- 8,18 ----
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright 2019 Joyent, Inc.
   */
  
  /*
   * Main conversion entry points. This has been designed such that there can be
   * any number of different conversion backends. Currently we only have one that
*** 166,178 ****
          }
  
          /*
           * Succsesful conversion.
           */
!         if (fp != NULL) {
!                 if (label == NULL)
!                         label = "";
                  if (ctf_add_label(fp, label, fp->ctf_typemax, 0) == CTF_ERR) {
                          *errp = ctf_errno(fp);
                          ctf_close(fp);
                          return (NULL);
                  }
--- 166,176 ----
          }
  
          /*
           * Succsesful conversion.
           */
!         if (fp != NULL && label != NULL) {
                  if (ctf_add_label(fp, label, fp->ctf_typemax, 0) == CTF_ERR) {
                          *errp = ctf_errno(fp);
                          ctf_close(fp);
                          return (NULL);
                  }