PM: intel_powerclamp: off by one in start_power_clamp()

This value has already been clamped correctly to 0 through 49 in
powerclamp_set_cur_state() so this patch doesn't actually change
anything.  But we should fix it anyway for consistency.

set_target_ratio is used as an offset into an array with
MAX_TARGET_RATIO (50) elements.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/intel_powerclamp.c

@@ -504,7 +504,7 @@ static int start_power_clamp(void)
 		return -EINVAL;
 	}
 
-	set_target_ratio = clamp(set_target_ratio, 0U, MAX_TARGET_RATIO);
+	set_target_ratio = clamp(set_target_ratio, 0U, MAX_TARGET_RATIO - 1);
 	/* prevent cpu hotplug */
 	get_online_cpus();