dfc: fix use-after-free

When IPA failed to send a QMAP packet, the skb is freed in IPA so
accessing the skb after IPA failure will result in use-after-free.

Remove the skb access after IPA send failure.

Change-Id: Id12894a8f4cc3d7bec717413d48f2430e1c959cf
Signed-off-by: Weiyi Chen <quic_weiyic@quicinc.com>