amrnbdec: use av_assert

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

libavcodec/amrnbdec.c

@@ -45,6 +45,7 @@
 
 #include "avcodec.h"
 #include "libavutil/common.h"
+#include "libavutil/avassert.h"
 #include "celp_math.h"
 #include "celp_filters.h"
 #include "acelp_filters.h"
@@ -478,7 +479,7 @@ static void decode_8_pulses_31bits(const int16_t *fixed_index,
 static void decode_fixed_sparse(AMRFixed *fixed_sparse, const uint16_t *pulses,
                                 const enum Mode mode, const int subframe)
 {
-    assert(MODE_4k75 <= mode && mode <= MODE_12k2);
+    av_assert1(MODE_4k75 <= mode && mode <= MODE_12k2);
 
     if (mode == MODE_12k2) {
         ff_decode_10_pulses_35bits(pulses, fixed_sparse, gray_decode, 5, 3);