[netdrvr s/390] trim trailing whitespace

Previous fix patches added a bunch of trailing whitespace,
which git-applymbox complained loudly about.
diff --git a/drivers/s390/net/qeth_tso.h b/drivers/s390/net/qeth_tso.h
index 1286dde..24ef40c 100644
--- a/drivers/s390/net/qeth_tso.h
+++ b/drivers/s390/net/qeth_tso.h
@@ -117,11 +117,11 @@
 	int fragno;
 	unsigned long addr;
 	int element, cnt, dlen;
-	
+
 	fragno = skb_shinfo(skb)->nr_frags;
 	element = *next_element_to_fill;
 	dlen = 0;
-	
+
 	if (is_tso)
 		buffer->element[element].flags =
 			SBAL_FLAGS_MIDDLE_FRAG;