MPC512X: Cleanup bus clock names.

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
diff --git a/cpu/mpc512x/speed.c b/cpu/mpc512x/speed.c
index a609827..99e3495 100644
--- a/cpu/mpc512x/speed.c
+++ b/cpu/mpc512x/speed.c
@@ -96,7 +96,7 @@
 		ips_clk = 0;
 	}
 
-	gd->ipb_clk = ips_clk;
+	gd->ips_clk = ips_clk;
 	gd->csb_clk = csb_clk;
 	gd->cpu_clk = core_clk;
 	gd->bus_clk = csb_clk;
@@ -118,7 +118,7 @@
 	printf ("Clock configuration:\n");
 	printf ("  CPU:                 %4d MHz\n", gd->cpu_clk / 1000000);
 	printf ("  Coherent System Bus: %4d MHz\n", gd->csb_clk / 1000000);
-	printf ("  IPS Bus:             %4d MHz\n", gd->ipb_clk / 1000000);
+	printf ("  IPS Bus:             %4d MHz\n", gd->ips_clk / 1000000);
 	printf ("  DDR:                 %4d MHz\n", 2 * gd->csb_clk / 1000000);
 	return 0;
 }