diag: Report error when return value is not DIAG_DCI_NO_ERROR

During initial handshake with remote DCI channel report error
while sending masks to remote processor only if the error is
not DIAG_DCI_NO_ERROR.

Change-Id: Id58777a6138bb395408ea55b4d5f91e2974a5c65
Signed-off-by: Sreelakshmi Gownipalli <sgownipa@codeaurora.org>