crypto: qcedev: Fix out of memory issue

Fixes memory leak issue which is caused due to unfreed memory
of req struct after processing the user space request , this
happens for every client who are using from user space through
ioctls.

Change-Id: I2f267b960a2c73a65b85e72b0bff9a87df68b4e0
Signed-off-by: AnilKumar Chimata <anilc@codeaurora.org>