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There is no need to directly initialize the spinlock_t in struct
uart_port. The structure is later passed to uart_add_one_port() which
initialize the complete struct including the lock member.

Remove spin_lock_init() on uart_port's internal lock.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20240301215246.891055-17-bigeasy@linutronix.de

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>