netlink: Rename pid to portid to avoid confusion

It is a frequent mistake to confuse the netlink port identifier with a
process identifier.  Try to reduce this confusion by renaming fields
that hold port identifiers portid instead of pid.

I have carefully avoided changing the structures exported to
userspace to avoid changing the userspace API.

I have successfully built an allyesconfig kernel with this change.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/irda/irnetlink.c b/net/irda/irnetlink.c
index 6c7c4b9..c329712 100644
--- a/net/irda/irnetlink.c
+++ b/net/irda/irnetlink.c
@@ -100,7 +100,7 @@
 		goto err_out;
 	}
 
-	hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
+	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
 			  &irda_nl_family, 0,  IRDA_NL_CMD_GET_MODE);
 	if (hdr == NULL) {
 		ret = -EMSGSIZE;