audio_device: Fix audio_rx_done_type_I_pcm_ff_cb bufor size check

Function was not checking buffer size correctly due missing parenthesis.

src/class/audio/audio_device.c

@@ -288,7 +288,8 @@ static bool audio_rx_done_type_I_pcm_ff_cb(uint8_t rhport, audiod_interface_t* a
   (void) rhport;
 
   // We expect to get a multiple of CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_RX * CFG_TUD_AUDIO_N_CHANNELS_RX per channel
-  if (bufsize % CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_RX*CFG_TUD_AUDIO_N_CHANNELS_RX != 0) {
+  if (bufsize % (CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_RX * CFG_TUD_AUDIO_N_CHANNELS_RX) != 0)
+  {
     return false;
   }