thermal: intel: int340x: Check return value of ptc_create_groups()

thermal: intel: int340x: Check return value of ptc_create_groups()

proc_thermal_ptc_add() ignores the return value of ptc_create_groups()
causing the driver to silenty continue even if sysfs group creation
fails.

The thermal control interface would be unavailable with no indication
of failure.

Check the return value and on failure clean up any sysfs groups that
were successfully created before the error, then propagate the error to
the caller which already handles it correctly via goto err_rem_rapl.

Signed-off-by: Aravind Anilraj <aravindanilraj0702@gmail.com>
Link: https://patch.msgid.link/20260329070642.10721-3-aravindanilraj0702@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>