RTEMS | bsps/riscv: Checked conditions for FDT pointer (!1057)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on bsps/shared/start/bsp-fdt.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1057#note_142345

 >  #ifdef BSP_DTB_IS_SUPPORTED
 > -  return system_dtb;
 > +  bsp_fdt = system_dtb;
 >  #else
 > -  return &bsp_fdt_blob[0];
 > +  bsp_fdt = &bsp_fdt_blob[0];
 >  #endif
 > +
 > +if (bsp_fdt == NULL) {
 > +    rtems_fatal(RTEMS_FATAL_SOURCE_BSP, 0);
 > +}
 > +
 > +if (((uintptr_t)bsp_fdt & 0x7) != 0) {
 > +    rtems_fatal(RTEMS_FATAL_SOURCE_BSP, FDT_ERR_ALIGNMENT);
 > +}
 > +int err = fdt_check_header(bsp_fdt);

declare all variables at the start of the block

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1057#note_142345
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