[IrDA]: Memory allocations cleanups

This patch replaces the bunch of arbitrary 64 and 128 bytes alloc_skb() calls
with more accurate allocation sizes.

Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c
index 7b7cd5b..7e1aea8 100644
--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -309,7 +309,8 @@
 
 	IRDA_ASSERT(self != NULL, return;);
 
-	skb = alloc_skb(64, GFP_ATOMIC);
+	skb = alloc_skb(TTP_MAX_HEADER + TTP_SAR_HEADER,
+			GFP_ATOMIC);
 	if (skb == NULL) {
 		IRDA_DEBUG(0, "%s() Unable to allocate sk_buff!\n",
 			   __FUNCTION__);