Fix a bug when use workaround for Legacy BIOS access limitation with GPT partition style

GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy.c

@@ -1771,6 +1771,18 @@ int ventoy_check_device(grub_device_t dev)
     }
 
     if (workaround)
+    {
+        if (grub_strncmp(g_ventoy_part_info->Head.Signature, "EFI PART", 8) == 0)
+        {
+            ventoy_gpt_part_tbl *PartTbl = g_ventoy_part_info->PartTbl;
+            if (PartTbl[1].StartLBA != PartTbl[0].LastLBA + 1 ||
+                (PartTbl[1].LastLBA + 1 - PartTbl[1].StartLBA) != 65536)
+            {
+                grub_file_close(file);
+                return ventoy_check_device_result(6);
+            }
+        }
+        else
         {
             ventoy_part_table *PartTbl = g_ventoy_part_info->MBR.PartTbl;
             if (PartTbl[1].StartSectorId != PartTbl[0].StartSectorId + PartTbl[0].SectorCount ||
@@ -1780,6 +1792,7 @@ int ventoy_check_device(grub_device_t dev)
                 return ventoy_check_device_result(6);
             }
         }
+    }
     else
     {
         offset = partition->start + partition->len;