Name
skb_padto — 
     pad an skbuff up to a minimal size
 
Arguments
- skb
- 
     buffer to pad
     
- len
- 
     minimal length
     
Description
   Pads up a buffer to ensure the trailing bytes exist and are
   blanked. If the buffer already contains sufficient data it
   is untouched. Otherwise it is extended. Returns zero on
   success. The skb is freed on error.