fix(app/attestation): release shared buf lock in error path

There was a missing call to rmm_el3_ifc_release_shared_buf() in
attest_el3_token_sign_pull_response_from_el3() for one of the error
path. This patch fixes the same.

Change-Id: I03adf54745d42af286f29feef0d44ef1be89b344
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
1 file changed