Fix parse_utsname(): dereference after null check.

  *** CID 1251488:  Dereference after null check  (FORWARD_NULL)
  /src/extension/kompat/kompat.c: 879 in parse_utsname()
  873              * or the complex one:
  874              *
  875              *  '\sysname\nodename\release\version\machine\domainname\hwcap\'
  876              *
  877              * This complex format is ugly on purpose: it ain't to be used
  878              * directly by users.  */
  >>>     CID 1251488:  Dereference after null check  (FORWARD_NULL)
  >>>     Dereferencing null pointer "string".
  879             if (string[0] == '\\') {
  880                     const char *start;
  881                     const char *end;
  882                     char *end2;
  883
  884                     /* Initial state of the parser.  */
Fix translate_execve_exit(): unused returned value.

  *** CID 1251487:  Unused value  (UNUSED_VALUE)
  /src/syscall/exit.c: 430 in translate_syscall_exit()
  424                     status = 0;
  425                     break;
  426             }
  427     #endif
  428
  429             case PR_execve:
  >>>     CID 1251487:  Unused value  (UNUSED_VALUE)
  >>>     Value from "translate_execve_exit(tracee)" is assigned to "status" here, but that stored value is not used before it is overwritten.
  430                     status = translate_execve_exit(tracee);
  431                     goto end;
  432
  433             case PR_ptrace:
  434                     status = translate_ptrace_exit(tracee);
  435                     break;