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/include/net/cfg80211.h b/include/net/cfg80211.h
index ba2e616..7b3b056 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2458,7 +2458,7 @@
 
 	int beacon_interval;
 
-	u32 ap_unexpected_nlpid;
+	u32 ap_unexpected_nlportid;
 
 #ifdef CONFIG_CFG80211_WEXT
 	/* wext data */