mac80211: call skb_put() before copying the data (trivial)

It doesn't have any actual effect here, but we should
skb_put() *before* copying the data.

Signed-off-by: Eliad Peller <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

net/mac80211/tx.c

···
 		/* Bitmap control */
 		*pos++ = n1 | aid0;
 		/* Part Virt Bitmap */
+		skb_put(skb, n2 - n1);
 		memcpy(pos, bss->tim + n1, n2 - n1 + 1);
 
 		tim[1] = n2 - n1 + 4;
-		skb_put(skb, n2 - n1);
 	} else {
 		*pos++ = aid0; /* Bitmap control */
 		*pos++ = 0; /* Part Virt Bitmap */