inet: Turn check for family in can_dump_sock into BUG_ON
inet: Turn check for family in can_dump_sock into BUG_ON

We only get there after and because-of family checks. No need
to check them again.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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