Fix clang warning in ath(4)

[Mark Kettenis]

Here clang complains about an implicit enum conversion.

Diff below fixes this by simply using the appropriate ieee80211 enum
in the HAL_OPMODE typedef and defining HAL_M_XXX as aliases for
IEEE80211_M_XXX.  This matches what we already do for HAL_LED_STATE.

ok?


Index: dev/ic/ar5xxx.h
===================================================================
RCS file: /cvs/src/sys/dev/ic/ar5xxx.h,v
retrieving revision 1.57
diff -u -p -r1.57 ar5xxx.h
--- dev/ic/ar5xxx.h     18 Dec 2016 14:34:20 -0000      1.57
+++ dev/ic/ar5xxx.h     23 Dec 2016 20:35:53 -0000
@@ -100,12 +100,12 @@ typedef enum {
        HAL_ANT_MAX = 3,
 } HAL_ANT_SETTING;
 
-typedef enum {
-       HAL_M_STA = 1,
-       HAL_M_IBSS = 0,
-       HAL_M_HOSTAP = 6,
-       HAL_M_MONITOR = 8,
-} HAL_OPMODE;
+typedef enum ieee80211_opmode HAL_OPMODE;
+
+#define        HAL_M_STA       IEEE80211_M_STA
+#define HAL_M_IBSS     IEEE80211_M_IBSS
+#define HAL_M_HOSTAP   IEEE80211_M_HOSTAP
+#define HAL_M_MONITOR  IEEE80211_M_MONITOR
 
 typedef int HAL_STATUS;