Avoid compilation warning

main.c

@@ -73,7 +73,7 @@ static void dump_memory_map(void)
     UINTN descriptor_size;
     UINT32 descriptor_version;
     EFI_STATUS status = g_system_table->BootServices->GetMemoryMap(&memory_map_size,
-            memory_map_buffer,
+            (EFI_MEMORY_DESCRIPTOR *)memory_map_buffer,
             &map_key,
             &descriptor_size,
             &descriptor_version);