Fix spelling of "occurred".

Signed-off-by: Vagrant Cascadian <vagrant@debian.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/enc28j60.c b/drivers/net/enc28j60.c
index 59ea11c..611eabb 100644
--- a/drivers/net/enc28j60.c
+++ b/drivers/net/enc28j60.c
@@ -381,7 +381,7 @@
 		udelay(1000);
 	}
 
-	/* timeout occured */
+	/* timeout occurred */
 	printf("%s: link down\n", enc->dev->name);
 	return 1;
 }