msm: ipa3: Correctly return error for ipa3_mdfy_flt_rule

Return the right error in internal mdfy_flt_rule for
better IPACM debugability and update the status last
after the modify in and out.

Change-Id: Id872cd8fcea9816d13a20a4cf71c47311897aa9d
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>