ieee1394: limit early node speed to host interface speed

The following patch limits the node speed to the host interface speed,
before using it.
Signed-off-by: NPhilippe De Muyter <phdm@macqel.be>

It should actually suffice to do this only for the local node's
speedcap[].  But there is another bug in the speed calculation:
The local node's speed is not correctly propagated to the speeds
which are to be used to access remote nodes.
http://thread.gmane.org/gmane.linux.kernel.firewire.devel/11772/focus=12024Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

drivers/ieee1394/ieee1394_core.c

@@ -373,6 +373,8 @@ static void build_speed_map(struct hpsb_host *host, int nodecount)
 			if (sid->port2 == SELFID_PORT_CHILD) cldcnt[n]++;
 
 			speedcap[n] = sid->speed;
+			if (speedcap[n] > host->csr.lnk_spd)
+				speedcap[n] = host->csr.lnk_spd;
 			n--;
 		}
 	}