staging: rtl8188eu: buf_ptr variable completely defined in a single line

It is simpler.
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/hal/fw.c

@@ -71,7 +71,7 @@ static void _rtl88e_fw_block_write(struct adapter *adapt,
 		usb_write32(adapt, offset, pu4BytePtr[i]);
 	}
 
-	buf_ptr += blk_cnt * blk_sz;
+	buf_ptr = buffer + blk_cnt * blk_sz;
 	for (i = 0; i < remain; i++, offset++) {
 		usb_write8(adapt, offset, buf_ptr[i]);
 	}