A call to pskb_may_pull() might reallocate skb->data. Therefore we
should only assign the src-pointer after any potential reallocations.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Backport of r46721
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@47001 3c298f89-4303-0410-b956-a3cf2f4a3e73