packet: use vzalloc()

alloc_one_pg_vec_page() is supposed to return zeroed memory, so use
vzalloc() instead of vmalloc()

Signed-off-by: Eric Dumazet <[e-mail]>
Cc: Neil Horman <[e-mail]>
Acked-by: Neil Horman <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/packet/af_packet.c

···
 	 * __get_free_pages failed, fall back to vmalloc
 	 */
 	*flags |= PGV_FROM_VMALLOC;
-	buffer = vmalloc((1 << order) * PAGE_SIZE);
+	buffer = vzalloc((1 << order) * PAGE_SIZE);
 
 	if (buffer)
 		return buffer;