Bad backport of "net: Fix skb_set_peeked use-after-free bug" in 3.18.23

[Paul Mackerras]

Commit d9a1133495b4 ("net: Fix skb_set_peeked use-after-free bug") in
3.18.23 claims to be a backport of commit a0a2a6602496, but in fact
the patch is identical to commit 738ac1ebb96d ("net: Clone skb before
setting peeked flag"), which is the commit that introduces the
use-after-free bug that a0a2a6602496 fixes.

The result is that we have been seeing crashes in __skb_recv_datagram
since I merged v3.18.24 into the kernel code we are using for a
product.  Could someone fix this with an actual backport of
a0a2a6602496 please?

Thanks,
Paul.
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