Documentation: application-developer: Use correct type to store size

The return type of std::vector::size() is size_t. Use the same type,
instead of unsigned int, to store its return value when retrieving the
number of allocated buffers.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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