avfilter: add av_cold where it is missing

libavfilter/af_flanger.c

@@ -72,7 +72,7 @@ static const AVOption flanger_options[] = {
 
 AVFILTER_DEFINE_CLASS(flanger);
 
-static int init(AVFilterContext *ctx)
+static av_cold int init(AVFilterContext *ctx)
 {
     FlangerContext *s = ctx->priv;
 

libavfilter/af_surround.c

@@ -1372,7 +1372,7 @@ static void filter_5_1_back(AVFilterContext *ctx)
     }
 }
 
-static int init(AVFilterContext *ctx)
+static av_cold int init(AVFilterContext *ctx)
 {
     AudioSurroundContext *s = ctx->priv;
     float overlap;

libavfilter/vf_colorspace.c

@@ -732,7 +732,7 @@ static int create_filtergraph(AVFilterContext *ctx,
     return 0;
 }
 
-static int init(AVFilterContext *ctx)
+static av_cold int init(AVFilterContext *ctx)
 {
     ColorSpaceContext *s = ctx->priv;
 

libavfilter/vf_delogo.c

@@ -221,7 +221,7 @@ static const AVOption delogo_options[]= {
 };
 
 AVFILTER_DEFINE_CLASS(delogo);
-static void uninit(AVFilterContext *ctx)
+static av_cold void uninit(AVFilterContext *ctx)
 {
     DelogoContext *s = ctx->priv;
 

libavfilter/vf_eq.c

@@ -207,7 +207,7 @@ static int initialize(AVFilterContext *ctx)
     return 0;
 }
 
-static void uninit(AVFilterContext *ctx)
+static av_cold void uninit(AVFilterContext *ctx)
 {
     EQContext *eq = ctx->priv;
 

libavfilter/vf_tpad.c

@@ -181,7 +181,7 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static void uninit(AVFilterContext *ctx)
+static av_cold void uninit(AVFilterContext *ctx)
 {
     TPadContext *s = ctx->priv;
 

libavfilter/vf_xbr.c

@@ -380,7 +380,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     return ff_filter_frame(outlink, out);
 }
 
-static int init(AVFilterContext *ctx)
+static av_cold int init(AVFilterContext *ctx)
 {
     XBRContext *s = ctx->priv;
     static const xbrfunc_t xbrfuncs[] = {xbr2x, xbr3x, xbr4x};

libavfilter/vf_zscale.c

@@ -702,7 +702,7 @@ fail:
     return ff_filter_frame(outlink, out);
 }
 
-static void uninit(AVFilterContext *ctx)
+static av_cold void uninit(AVFilterContext *ctx)
 {
     ZScaleContext *s = ctx->priv;