Fixed GPT calculation with 512 hardcoded

tsk3/vs/gpt.c

@@ -125,7 +125,7 @@ gpt_load_table(TSK_VS_INFO * vs)
     snprintf(head_str, 16, "GPT Header");
     if (NULL == tsk_vs_part_add(vs, (TSK_DADDR_T) 1,
             (TSK_DADDR_T) ((tsk_getu32(vs->endian,
-                        &head->head_size_b) + 511) / 512),
+                        &head->head_size_b) + (vs->block_size-1)) / vs->block_size),
             TSK_VS_PART_FLAG_META, head_str, -1, -1)) {
         free(sect_buf);
         return 1;
@@ -151,7 +151,7 @@ gpt_load_table(TSK_VS_INFO * vs)
     if (NULL == tsk_vs_part_add(vs, (TSK_DADDR_T) tsk_getu64(vs->endian,
                 &head->tab_start_lba),
             (TSK_DADDR_T) ((ent_size * tsk_getu32(vs->endian,
-                        &head->tab_num_ent) + 511) / 512),
+                        &head->tab_num_ent) + (vs->block_size-1)) / vs->block_size),
             TSK_VS_PART_FLAG_META, tab_str, -1, -1)) {
         free(sect_buf);
         return 1;