Fix max macro in kenwood.c -- wasn't being used anyways

rigs/kenwood/kenwood.c

@@ -42,7 +42,7 @@
 #include "ts990s.h"
 
 #ifndef max
-#define max(a,b) (((a) (b)) ? (a) : (b))
+#define max(a,b) (((a) > (b)) ? (a) : (b))
 #define min(a,b) (((a) < (b)) ? (a) : (b))
 #endif