serial: 8250_ni: Reorder local variables

Reorder local variables in ni16550_probe to follow reverse Christmas
tree style.

Cc: Jason Smith <jason.smith@emerson.com>
Cc: Gratian Crisan <gratian.crisan@emerson.com>
Signed-off-by: Chaitanya Vadrevu <chaitanya.vadrevu@emerson.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250711200418.1858682-3-chaitanya.vadrevu@emerson.com


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