[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/include/net/irda/irlmp.h b/include/net/irda/irlmp.h
index 11ecfa5..e212b9b 100644
--- a/include/net/irda/irlmp.h
+++ b/include/net/irda/irlmp.h
@@ -48,7 +48,7 @@
 #define DEV_ADDR_ANY  0xffffffff
 
 #define LMP_HEADER          2    /* Dest LSAP + Source LSAP */
-#define LMP_CONTROL_HEADER  4
+#define LMP_CONTROL_HEADER  4    /* LMP_HEADER + opcode + parameter */
 #define LMP_PID_HEADER      1    /* Used by Ultra */
 #define LMP_MAX_HEADER      (LMP_CONTROL_HEADER+LAP_MAX_HEADER)