inet: frags: save a pair of atomic operations in reassembly

As mentioned in commit 648700f76b03 ("inet: frags:
use rhashtables for reassembly units"):

  A followup patch will even remove the refcount hold/release
  left from prior implementation and save a couple of atomic
  operations.

This patch implements this idea, seven years later.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20250312082250.1803501-5-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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