10124 smatch fixes for cryptoadm

*** 21,30 ****
--- 21,31 ----
  /*
   * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
   */
  /*
   * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
+  * Copyright (c) 2018, Joyent, Inc.
   */
  
  #include <fcntl.h>
  #include <stdio.h>
  #include <stdlib.h>
*** 264,273 ****
--- 265,275 ----
          }
  
          if ((fd = open(ADMIN_IOCTL_DEVICE, O_RDONLY)) == -1) {
                  cryptoerror(LOG_STDERR, gettext("failed to open %s: %s"),
                      ADMIN_IOCTL_DEVICE, strerror(errno));
+                 free(pdevlist);
                  return (FAILURE);
          }
  
          pdevlist->dl_dev_count = count;
          if (ioctl(fd, CRYPTO_GET_DEV_LIST, pdevlist) == -1) {