msm:ipa: Fix to incorrect structure access

Accessing of incorrect structure pointer is causing
memory out of bound access, fixed issue by accessing
the correct structure pointer.

Change-Id: I3c2f5f7a97cac854093ef670184d06db4231f5e1
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>