Bug 1605134 - Remove assert that catches a graph iterating 0 ticks. r=padenot

0 ticks is fine, and happens often for graphs with a low sample rate because in
such cases the minimum 128-frame AudioBlock is rather large and spans multiple
iterations.

Differential Revision: https://phabricator.services.mozilla.com/D97833

dom/media/DynamicResampler.cpp

@@ -396,8 +396,6 @@ void AudioResampler::AppendInput(const AudioSegment& aInSegment) {
 }
 
 AudioSegment AudioResampler::Resample(uint32_t aOutFrames) {
-  MOZ_ASSERT(aOutFrames);
-
   AudioSegment segment;
 
   // We don't know what to do yet and we only have received silence if any just