Drop some completely unnecessary av_unused attributes.

libavfilter/vf_gradfun.c

@@ -120,7 +120,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
     GradFunContext *gf = ctx->priv;
     float thresh = 1.2;
     int radius = 16;
-    av_unused int cpu_flags = av_get_cpu_flags();
+    int cpu_flags = av_get_cpu_flags();
 
     if (args)
         sscanf(args, "%f:%d", &thresh, &radius);

libavfilter/vf_yadif.c

@@ -372,7 +372,7 @@ static int query_formats(AVFilterContext *ctx)
 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 {
     YADIFContext *yadif = ctx->priv;
-    av_unused int cpu_flags = av_get_cpu_flags();
+    int cpu_flags = av_get_cpu_flags();
 
     yadif->mode = 0;
     yadif->parity = -1;

libavformat/nsvdec.c

@@ -273,7 +273,7 @@ static int nsv_parse_NSVf_header(AVFormatContext *s)
 {
     NSVContext *nsv = s->priv_data;
     AVIOContext *pb = s->pb;
-    unsigned int av_unused file_size;
+    unsigned int file_size;
     unsigned int size;
     int64_t duration;
     int strings_size;

libswscale/output.c

@@ -899,12 +899,11 @@ yuv2rgb_X_c_template(SwsContext *c, const int16_t *lumFilter,
     int i;
 
     for (i = 0; i < (dstW >> 1); i++) {
-        int j;
+        int j, A1, A2;
         int Y1 = 1 << 18;
         int Y2 = 1 << 18;
         int U  = 1 << 18;
         int V  = 1 << 18;
-        int av_unused A1, A2;
         const void *r, *g, *b;
 
         for (j = 0; j < lumFilterSize; j++) {
@@ -1106,8 +1105,7 @@ yuv2rgb_full_X_c_template(SwsContext *c, const int16_t *lumFilter,
         int Y = 0;
         int U = -128 << 19;
         int V = -128 << 19;
-        int av_unused A;
-        int R, G, B;
+        int R, G, B, A;
 
         for (j = 0; j < lumFilterSize; j++) {
             Y += lumSrc[j][i] * lumFilter[j];