Cleanup: fix "MHz" spelling

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/drivers/net/ns8382x.c b/drivers/net/ns8382x.c
index a2d61af..198f73d 100644
--- a/drivers/net/ns8382x.c
+++ b/drivers/net/ns8382x.c
@@ -445,7 +445,7 @@
 	Read and write MII registers using software-generated serial MDIO
 	protocol.  See the MII specifications or DP83840A data sheet for details.
 
-	The maximum data clock rate is 2.5 Mhz.  To meet minimum timing we
+	The maximum data clock rate is 2.5 MHz.  To meet minimum timing we
 	must flush writes to the PCI bus with a PCI read. */
 #define mdio_delay(mdio_addr) INL(dev, mdio_addr)