netpoll: Use rtnl_dereference() for npinfo pointer access

In the __netpoll_setup() function, when accessing the device's npinfo
pointer, replace rcu_access_pointer() with rtnl_dereference(). This
change is more appropriate, as suggested by Herbert Xu[1].

The function is called with the RTNL mutex held, and the pointer is
being dereferenced later, so, dereference earlier and just reuse the
pointer for the if/else.

The replacement ensures correct pointer access while maintaining
the existing locking and RCU semantics of the netpoll subsystem.

Link: https://lore.kernel.org/lkml/[email protected]/ [1]
Suggested-by: Herbert Xu <[email protected]>
Signed-off-by: Breno Leitao <[email protected]>
Reviewed-by: Jacob Keller <[email protected]>
Acked-by: Herbert Xu <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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