serial: 8250: omap: Cleanup on error in request_irq

serial: 8250: omap: Cleanup on error in request_irq

If devm_request_irq fails, the code does not cleanup many things that
were setup before. Instead of directly returning ret we should jump to
err.

Fixes: fef4f600319e ("serial: 8250: omap: Fix life cycle issues for interrupt handlers")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20240807141227.1093006-4-msp@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>