conn_test_app: refer to memref.size when determining size of output
conn_test_app: refer to memref.size when determining size of output

Change-Id: I895ba4258f7108ea9b9883c8054bca84eabf0100
Signed-off-by: Thomas Nyman <637edc83cb495d74e75d0415e2e205da088dba42@aalto.fi>

Open-TEE/CAs,Open-TEE/CAs