ASoC: amd: ps: fix byte count return value for invalid SoundWire manager instance

acp_get_byte_count() function should return zero bytes instead of
-EINVAL for invalid SoundWire manager instance.

Fixes: f722917350 ("ASoC: amd: ps: add SoundWire dma driver dma ops")
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://lore.kernel.org/r/20230626105356.2580125-5-Vijendar.Mukunda@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/ps/ps-sdw-dma.c

@@ -318,12 +318,13 @@ static u64 acp63_sdw_get_byte_count(struct acp_sdw_dma_stream *stream, void __io
 		pos_high_reg = sdw1_dma_ring_buf_reg[stream->stream_id].pos_high_reg;
 		break;
 	default:
-		return -EINVAL;
+		goto POINTER_RETURN_BYTES;
 	}
 	if (pos_low_reg) {
 		byte_count.bcount.high = readl(acp_base + pos_high_reg);
 		byte_count.bcount.low = readl(acp_base + pos_low_reg);
 	}
+POINTER_RETURN_BYTES:
 	return byte_count.bytescount;
 }