FROMLIST: qcrypto: protect potential integer overflow.

Adding user passed parameters without check might
lead to Integer overflow and unpredictable system
behaviour.

Bug: 34389927
Change-Id: Iaf8259e3c4a157e1790f1447b1b62a646988b7c4
Signed-off-by: Neeraj Soni <neersoni@codeaurora.org>
Signed-off-by: Steve Pfetsch <spfetsch@google.com>
(am from https://source.codeaurora.org/quic/la/kernel/msm-3.18/commit/?id=bd9a8fc6d7f6bd1a0b936994630006de450df657)