10138 smatch fixes for usr/src/cmd/sgs

*** 27,36 ****
--- 27,40 ----
  /*
   *      Copyright (c) 1988 AT&T
   *        All Rights Reserved
   */
  
+ /*
+  * Copyright (c) 2018, Joyent, Inc.
+  */
+ 
  #include <memory.h>
  #include <malloc.h>
  #include <limits.h>
  
  #include <sgs.h>
*** 741,753 ****
  {
          size_t          sz;
          unsigned        u;
          Ehdr            *eh = elf->ed_ehdr;
  
-         if (elf == 0)
-                 return (-1);
- 
          ELFWLOCK(elf)
          switch (cmd) {
          default:
                  _elf_seterr(EREQ_UPDATE, 0);
                  ELFUNLOCK(elf)
--- 745,754 ----