num_out_res which is part of acquire arguments from UMD
is not validated. Compute buffer size only if num_out_res
is within the valid range.

Change-Id: I9cc577df8f92b66f7f721977575d58536e4c1f2f
Signed-off-by: Vishalsingh Hajeri <vhajeri@codeaurora.org>
Signed-off-by: Raja Mallik <rmallik@codeaurora.org>