avresample: Add av_cold attributes to init functions missing them

libavresample/audio_mix.c

@@ -282,7 +282,7 @@ static void mix_2_to_6_fltp_flt_c(float **samples, float **matrix, int len,
     }
 }
 
-static int mix_function_init(AudioMix *am)
+static av_cold int mix_function_init(AudioMix *am)
 {
     am->func_descr = am->func_descr_generic = "n/a";
     am->mix = am->mix_generic = NULL;

libavresample/dither.c

@@ -31,6 +31,7 @@
 #include <math.h>
 #include <stdint.h>
 
+#include "libavutil/attributes.h"
 #include "libavutil/common.h"
 #include "libavutil/lfg.h"
 #include "libavutil/mem.h"
@@ -325,7 +326,7 @@ void ff_dither_free(DitherContext **cp)
     av_freep(cp);
 }
 
-static void dither_init(DitherDSPContext *ddsp,
+static av_cold void dither_init(DitherDSPContext *ddsp,
                                 enum AVResampleDitherMethod method)
 {
     ddsp->quantize      = quantize_c;