avutil/opt: remove disabled old ABI compatibility code

Fixes some unused variable warnings
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/opt.c

@@ -583,7 +583,6 @@ static int set_format(void *obj, const char *name, int fmt, int search_flags,
     const AVOption *o = av_opt_find2(obj, name, NULL, 0,
                                      search_flags, &target_obj);
     int min, max;
-    const AVClass *class = *(AVClass **)obj;
 
     if (!o || !target_obj)
         return AVERROR_OPTION_NOT_FOUND;
@@ -593,16 +592,9 @@ static int set_format(void *obj, const char *name, int fmt, int search_flags,
         return AVERROR(EINVAL);
     }
 
-#if LIBAVUTIL_VERSION_MAJOR < 54
-    if (class->version && class->version < AV_VERSION_INT(52, 11, 100)) {
-        min = -1;
-        max = nb_fmts-1;
-    } else
-#endif
-    {
-        min = FFMAX(o->min, -1);
-        max = FFMIN(o->max, nb_fmts-1);
-    }
+    min = FFMAX(o->min, -1);
+    max = FFMIN(o->max, nb_fmts-1);
+
     if (fmt < min || fmt > max) {
         av_log(obj, AV_LOG_ERROR,
                "Value %d for parameter '%s' out of %s format range [%d - %d]\n",
@@ -1190,7 +1182,6 @@ void av_opt_set_defaults(void *s)
 void av_opt_set_defaults2(void *s, int mask, int flags)
 {
 #endif
-    const AVClass *class = *(AVClass **)s;
     const AVOption *opt = NULL;
     while ((opt = av_opt_next(s, opt)) != NULL) {
         void *dst = ((uint8_t*)s) + opt->offset;
@@ -1239,20 +1230,10 @@ void av_opt_set_defaults2(void *s, int mask, int flags)
                 set_string_video_rate(s, opt, opt->default_val.str, dst);
                 break;
             case AV_OPT_TYPE_PIXEL_FMT:
-#if LIBAVUTIL_VERSION_MAJOR < 54
-                if (class->version && class->version < AV_VERSION_INT(52, 10, 100))
-                    av_opt_set(s, opt->name, opt->default_val.str, 0);
-                else
-#endif
-                    write_number(s, opt, dst, 1, 1, opt->default_val.i64);
+                write_number(s, opt, dst, 1, 1, opt->default_val.i64);
                 break;
             case AV_OPT_TYPE_SAMPLE_FMT:
-#if LIBAVUTIL_VERSION_MAJOR < 54
-                if (class->version && class->version < AV_VERSION_INT(52, 10, 100))
-                    av_opt_set(s, opt->name, opt->default_val.str, 0);
-                else
-#endif
-                    write_number(s, opt, dst, 1, 1, opt->default_val.i64);
+                write_number(s, opt, dst, 1, 1, opt->default_val.i64);
                 break;
             case AV_OPT_TYPE_BINARY:
             case AV_OPT_TYPE_DICT: