fix memory allocation for f16_f16_f16p example
Signed-off-by:Charlotte Chen <charlotte.chen@arm.com> Approved-by:
Jakub Sujak <jakub.sujak@arm.com>
Signed-off-by:Charlotte Chen <charlotte.chen@arm.com> Approved-by:
Jakub Sujak <jakub.sujak@arm.com>