xen-netfront: Remove BUGs on paged skb data which crosses a page boundary

xen-netfront: Remove BUGs on paged skb data which crosses a page boundary

These BUGs can be erroneously triggered by frags which refer to
tail pages within a compound page. The data in these pages may
overrun the hardware page while still being contained within the
compound page, but since compound_order() evaluates to 0 for tail
pages the assertion fails. The code already iterates through
subsequent pages correctly in this scenario, so the BUGs are
unnecessary and can be removed.

Fixes: f36c374782e4 ("xen/netfront: handle compound page fragments on transmit")
Cc: <[email protected]> # 3.7+
Signed-off-by: Seth Forshee <[email protected]>
Reviewed-by: David Vrabel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>