checkasm/hevc_add_res: prepare test data only if the fuction is not tested

checkasm/hevc_add_res: prepare test data only if the fuction is not tested

check_func will return NULL for functions that have already been tested. If
the func is tested and skipped (which happens several times), there is no
need to prepare data(randomize_buffers and memcpy).

Move relative code in compare_add_res(), prepare data and do check only if
the function is not tested.

Signed-off-by: Linjie Fu <linjie.fu@intel.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>