net: fully inline backlog_unlock_irq_restore()

net: fully inline backlog_unlock_irq_restore()

Some arches (like x86) do not inline spin_unlock_irqrestore().

backlog_unlock_irq_restore() is in RPS/RFS critical path,
we prefer using spin_unlock() + local_irq_restore() for
optimal performance.

Also change backlog_unlock_irq_restore() second argument
to avoid a pointless dereference.

No difference in net/core/dev.o code size.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260105163054.13698-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>