12001 cpu_uarray_free(NULL) panics

*** 8,18 ****
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright (c) 2018, Joyent, Inc.
   */
  
  #include <sys/cpu_uarray.h>
  #include <sys/sysmacros.h>
  #include <sys/cpuvar.h>
--- 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.
   */
  
  #include <sys/cpu_uarray.h>
  #include <sys/sysmacros.h>
  #include <sys/cpuvar.h>
*** 43,52 ****
--- 43,53 ----
  }
  
  void
  cpu_uarray_free(cpu_uarray_t *cua)
  {
+         if (cua != NULL)
                  kmem_free(cua, cpu_uarray_size(cua->cu_nr_items));
  }
  
  uint64_t
  cpu_uarray_sum(cpu_uarray_t *cua, size_t index)