thermal: gov_power_allocator: Return early in manage if trip_max is NULL

Commit da781936 ("thermal: gov_power_allocator: Allow binding
without trip points") allowed the governor to bind even when trip_max
is NULL. This allows a NULL pointer dereference to happen in the manage
callback.

Add an early return to prevent it, since the governor is expected to not do
anything in this case.

Fixes: da781936 ("thermal: gov_power_allocator: Allow binding without trip points")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://patch.msgid.link/20240702-power-allocator-null-trip-max-v1-1-47a60dc55414@collabora.com
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/thermal/gov_power_allocator.c

@@ -759,6 +759,9 @@ static void power_allocator_manage(struct thermal_zone_device *tz)
 		return;
 	}
 
+	if (!params->trip_max)
+		return;
+
 	allocate_power(tz, params->trip_max->temperature);
 	params->update_cdevs = true;
 }