avcodec/psymodel: Fix () in AAC_CUTOFF() macro

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/psymodel.h

@@ -29,7 +29,7 @@
 /** maximum number of channels */
 #define PSY_MAX_CHANS 20
 
-#define AAC_CUTOFF(s) (s->bit_rate ? FFMIN3(4000 + s->bit_rate/8, 12000 + s->bit_rate/32, s->sample_rate / 2) : (s->sample_rate / 2))
+#define AAC_CUTOFF(s) ((s)->bit_rate ? FFMIN3(4000 + (s)->bit_rate/8, 12000 + (s)->bit_rate/32, (s)->sample_rate / 2) : ((s)->sample_rate / 2))
 
 /**
  * single band psychoacoustic information