idsn: fix wrong skb_put() used

in my commit b952f4df,
-	*(u8 *)skb_put(skb_out, 1) = (u8)(accm >> 24);	\
+	skb_put(skb_out, (u8)(accm >> 24));	\
it should skb_put_u8()

Fixes: b952f4df ("net: manual clean code which call skb_put_[data:zero])")
Signed-off-by: Nyuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/isdn/i4l/isdn_bsdcomp.c

@@ -472,7 +472,7 @@ static int bsd_compress(void *state, struct sk_buff *skb_in, struct sk_buff *skb
 		accm |= ((ent) << bitno);				\
 		do	{						\
 			if (skb_out && skb_tailroom(skb_out) > 0)	\
-				skb_put(skb_out, (u8)(accm >> 24));	\
+				skb_put_u8(skb_out, (u8)(accm >> 24));	\
 			accm <<= 8;					\
 			bitno += 8;					\
 		} while (bitno <= 24);					\