RTEMS | powerpc/beatnik: Convert MOTLoad GEV variables into env variables (!1276)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on bsps/powerpc/shared/start/motload-gev-net-env.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1276#note_152548

 > +   * and the values are used if there are no explictic names set.
 > +   */
 > +  char var[256];
 > +  struct gev_net_var vars;
 > +  int r;
 > +  if (unit < 1) {
 > +    return;
 > +  }
 > +  memset(&vars, 0, sizeof(vars));
 > +  snprintf(&var[0], sizeof(var), "RTEMS_NET_IFACE_%i", unit);
 > +  setenv(var, label, 1);
 > +  r = motload_gev_get(nvram_base, "mot-script-boot", &var[0], sizeof(var));
 > +  if (r > 0) {
 > +    const char* tftp_get = strnstr(var, "tftpGet", r);
 > +    if (tftp_get != NULL) {
 > +      const char* tftp_get_end = strnstr(tftp_get, "\n", r);

need to validate `!NULL`

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1276#note_152548
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