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`mt7621_nfc_write_page_hwecc` may be called with `buf=NULL`, but `mt7621_nfc_check_empty_page` always tries to read it. That caused Oops: `Unable to handle kernel paging request at virtual address 00000000` Fixes: FS#3416 Signed-off-by: Anton Ryzhov <anton@ryzhov.me>