Don't check offload support for formats without defined sample rate.

Otherwise the Builder of AudioFormat will throw because we pass in
an invalid value.

#minor-release

PiperOrigin-RevId: 535169406

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DefaultAudioOffloadSupportProvider.java

@@ -71,7 +71,7 @@ public final class DefaultAudioOffloadSupportProvider
     checkNotNull(format);
     checkNotNull(audioAttributes);
 
-    if (Util.SDK_INT < 29) {
+    if (Util.SDK_INT < 29 || format.sampleRate == Format.NO_VALUE) {
       return AudioOffloadSupport.DEFAULT_UNSUPPORTED;
     }