spelling: s/trough/through/

Additionally, one comment was reformulated by Joe Perches <joe@perches.com>.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/net/pcmcia/xirc2ps_cs.c b/drivers/net/pcmcia/xirc2ps_cs.c
index 049c34b..593d8ad 100644
--- a/drivers/net/pcmcia/xirc2ps_cs.c
+++ b/drivers/net/pcmcia/xirc2ps_cs.c
@@ -1598,7 +1598,7 @@
     switch(cmd) {
       case SIOCGMIIPHY:		/* Get the address of the PHY in use. */
 	data[0] = 0;		/* we have only this address */
-	/* fall trough */
+	/* fall through */
       case SIOCGMIIREG:		/* Read the specified MII register. */
 	data[3] = mii_rd(ioaddr, data[0] & 0x1f, data[1] & 0x1f);
 	break;