adts_aac_probe: mark buffer pointers as const

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

libavformat/aacdec.c

@@ -31,10 +31,10 @@ static int adts_aac_probe(AVProbeData *p)
 {
     int max_frames = 0, first_frames = 0;
     int fsize, frames;
-    uint8_t *buf0 = p->buf;
-    uint8_t *buf2;
-    uint8_t *buf;
-    uint8_t *end = buf0 + p->buf_size - 7;
+    const uint8_t *buf0 = p->buf;
+    const uint8_t *buf2;
+    const uint8_t *buf;
+    const uint8_t *end = buf0 + p->buf_size - 7;
 
     buf = buf0;