hwmon: (pxe1610) Check return value of page-select write in probe

hwmon: (pxe1610) Check return value of page-select write in probe

pxe1610_probe() writes PMBUS_PAGE to select page 0 but does not check
the return value. If the write fails, subsequent register reads operate
on an indeterminate page, leading to silent misconfiguration.

Check the return value and propagate the error using dev_err_probe(),
which also handles -EPROBE_DEFER correctly without log spam.

Fixes: 344757bac526 ("hwmon: (pmbus) Add Infineon PXE1610 VR driver")
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
Link: https://lore.kernel.org/r/20260329170925.34581-4-sanman.pradhan@hpe.com
[groeck: Fix "Fixes" SHA]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>