rc80211-pid: pf_target tuning

Set a better value for percentage target for failed frames. The previous value
slowed down too much rate increases in case of permanently low activity. While
at it, increase readability.
Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mac80211/rc80211_pid.h

@@ -39,7 +39,7 @@
  * link quality is good, the controller will fail to adjust failed frames
  * percentage to the target. This is intentional.
  */
-#define RC_PID_TARGET_PF 11
+#define RC_PID_TARGET_PF		14
 
 /* Rate behaviour normalization quantity over time. */
 #define RC_PID_NORM_OFFSET		3