[source] mac80211: fix tx power regression

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/5bd006aa2689d1ec813936b13eb1eb85ef4a0ab8

commit 5bd006aa2689d1ec813936b13eb1eb85ef4a0ab8
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Fri Oct 13 20:27:33 2017 +0200

    mac80211: fix tx power regression
    
    Revert an accidental change that was introduced by having an old version
    of the patch in my git tree, which was merged in 609208597b6d
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 .../315-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/kernel/mac80211/patches/315-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch b/package/kernel/mac80211/patches/315-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch
index 59e4dde..7808351 100644
--- a/package/kernel/mac80211/patches/315-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch
+++ b/package/kernel/mac80211/patches/315-ath9k-adjust-tx-power-reduction-for-US-regulatory-do.patch
@@ -17,7 +17,7 @@ Signed-off-by: Felix Fietkau <nbd at nbd.name>
  
 +	/* FCC allows maximum antenna gain of 3 dBi */
 +	if (reg->region == NL80211_DFS_FCC)
-+		ant_reduction = min_t(int, ant_reduction - 6, 0);
++		ant_reduction = max_t(int, ant_reduction - 6, 0);
 +
  	ah->eep_ops->set_txpower(ah, chan, ctl, ant_reduction, new_pwr, test);
  }