iio:buffer: Wrong sized allocation of demux table elements.

The size of the allocation is currently set to the size of the pointer
rather than the structure we should actually be allocating.
Signed-off-by: NJonathan Cameron <jic23@kernel.org>
Reported-by: kbuild@01.org
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NLars-Peter Clausen <lars@metafoo.de>

drivers/iio/industrialio-buffer.c

@@ -951,7 +951,7 @@ static int iio_buffer_add_demux(struct iio_buffer *buffer,
 		(*p)->to + (*p)->length == out_loc) {
 		(*p)->length += length;
 	} else {
-		*p = kmalloc(sizeof(*p), GFP_KERNEL);
+		*p = kmalloc(sizeof(**p), GFP_KERNEL);
 		if (*p == NULL)
 			return -ENOMEM;
 		(*p)->from = in_loc;