net/net.c: Update ipaddr if the environment has changed

At least on ARM the ipaddr is only set in board_init_r function. The
problem is if ipaddr is not defined in environment importing another
environment defined don't update the ipaddr value.

For example, suppose we've a default environment without net variables
defined and we want to import an uEnv.txt environment from SD-card like
this:

  ipaddr=192.168.2.240
  netmask=255.255.255.0
  gatewayip=192.168.2.1
  serverip=192.168.2.114

Then if you try boot from NFS results in:

  Importing environment from mmc ...
  Running uenvcmd ...
  smc911x: detected LAN9221 controller
  smc911x: phy initialized
  smc911x: MAC ac:de:48:00:00:00
  *** ERROR: `ipaddr' not set

The ipaddr at this point is NULL beacause is only set at board_init_r
function. This patch updates the ipaddr value if the environment has
changed.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>

net/net.c

@@ -321,7 +321,8 @@ NetInitLoop(proto_t protocol)
 
 	/* update only when the environment has changed */
 	if (env_changed_id != env_id) {
-		NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
+		NetOurIP = getenv_IPaddr("ipaddr");
+		NetCopyIP(&bd->bi_ip_addr, &NetOurIP);
 		NetOurGatewayIP = getenv_IPaddr("gatewayip");
 		NetOurSubnetMask = getenv_IPaddr("netmask");
 		NetServerIP = getenv_IPaddr("serverip");