pwmconfig: Further raise the fan threshold

Modern 4-pin fans can have a minimum speed (PWM=0) which is still
relatively high. I've seen 4500 RPM fans lower their speed to only
3500 RPM, which is 77% of the maximum speed, above our current
detection threshold (3/4 or 75%). Increase the threshold to 5/6
(roughly 83%) to make sure such fans are handled properly.

References: boo#1181890
Signed-off-by: Jean Delvare <jdelvare@suse.de>

prog/pwm/pwmconfig

@@ -451,7 +451,7 @@ do
 		OS=$(echo $SPEEDS | cut -d' ' -f$count)
 		S=$(echo $CURRENT_SPEEDS | cut -d' ' -f$count)
 		echo "  $j ... speed was $OS now $S"
-		let threshold=3*$OS/4
+		let threshold=5*$OS/6
 		if [ $S -lt $threshold ]
 		then
 			echo "    It appears that fan $j"