isdn: eicon: Use offsetof
Use offsetof instead of explicit implementation. * fixes bug with omitted & like: len = (byte)(((T30_INFO *) 0)->station_id + 20) * avoids compiler warnings with wrong sizes (pointer-to-char cast): len = (byte)(&(((T30_INFO *) 0)->universal_6)); * cleans up the code Signed-off-by: NJiri Slaby <jirislaby@gmail.com> Cc: Karsten Keil <isdn@linux-pingi.de> Acked-by: NArmin Schindler <armin@melware.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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