rc80211-pid: fix definition of rate control interval

Fix the rate control interval definition. Thanks to Mattias Nissler for
spotting this out.

Cc: Mattias Nissler <mattias.nissler@gmx.de>
Signed-off-by: NStefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/mac80211/rc80211_pid.h

@@ -10,8 +10,8 @@
 #ifndef RC80211_PID_H
 #define RC80211_PID_H
 
-/* Sampling period for measuring percentage of failed frames. */
-#define RC_PID_INTERVAL			(HZ / 8)
+/* Sampling period for measuring percentage of failed frames in ms. */
+#define RC_PID_INTERVAL			125
 
 /* Exponential averaging smoothness (used for I part of PID controller) */
 #define RC_PID_SMOOTHING_SHIFT		3