[NET]: Annotate checksums in on-the-wire packets.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index d308f12..72cc355 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -30,7 +30,7 @@
 #else
 #error  "Adjust your <asm/byteorder.h> defines"
 #endif
-	__u16	dccph_checksum;
+	__sum16	dccph_checksum;
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	__u8	dccph_x:1,
 		dccph_type:4,