mux: gpio: Simplify code by using dev_err_probe()

Use already prepared dev_err_probe() introduced by the commit
a787e540 ("driver core: add device probe log helper").
It simplifies EPROBE_DEFER handling.

Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210330193325.68362-3-andriy.shevchenko@linux.intel.com


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