msm: ipa3: Fix to NULL pointer dereference

Fix to null pointer dereference. Removed extra code
without using use_ipa_pm flag as code already present
under flag use_ipa_pm.

Change-Id: I53c0877114a057d5022dcf9be000385be550ae46
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>