serial: imx: add error messages when .probe fails
Some functions called by serial_imx_probe emit an error message themself (like kmalloc() and friends). clk_prepare_enable() and devm_request_irq() however don't which might make the driver silently fail to probe. So add an error message for these. Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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