af_aresample: do not request a buffer with AV_PERM_REUSE2 permissions in filter_samples()

That was pointless. Simplify.

libavfilter/af_aresample.c

@@ -268,10 +268,8 @@ static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamplesref
         if (aresample->outsamplesref)
             avfilter_unref_buffer(aresample->outsamplesref);
 
-        aresample->outsamplesref = avfilter_get_audio_buffer(outlink,
-                                                            AV_PERM_WRITE | AV_PERM_REUSE2,
-                                                             requested_out_nb_samples);
-
+        aresample->outsamplesref =
+            avfilter_get_audio_buffer(outlink, AV_PERM_WRITE, requested_out_nb_samples);
         avfilter_copy_buffer_ref_props(aresample->outsamplesref, insamplesref);
         aresample->outsamplesref->pts =
             insamplesref->pts / inlink->sample_rate * outlink->sample_rate;