msm: ipa: dynamic memory leak fix

This is a fix for dynamic memory leak seen with incorrectly
allocating memory of a different size than with intended
size.

Change-Id: I821442ee6728ea90ceab7644e194f4e06369333a
Acked-by: Jyothi Jayanthi <jyothij@qti.qualcomm.com>
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>