output/alsa: fix wrong use of `errno`

alsa-lib doesn't set errno, it returns errors as negative integers.

output/alsa: fix wrong use of `errno`
7f143a83 · Max Kellermann · 6ccc2541 · 7f143a83
Commit 7f143a83 authored Nov 14, 2018 by Max Kellermann
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AlsaOutputPlugin.cxx src/output/plugins/AlsaOutputPlugin.cxx +1 -1

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--- a/src/output/plugins/AlsaOutputPlugin.cxx
+++ b/src/output/plugins/AlsaOutputPlugin.cxx
@@ -727,7 +727,7 @@ AlsaOutput::DrainInternal()
 	/* drain period_buffer */
 	if (!period_buffer.IsEmpty()) {
 		auto frames_written = WriteFromPeriodBuffer();
-		if (frames_written < 0 && errno != EAGAIN) {
+		if (frames_written < 0 && frames_written != -EAGAIN) {
 			CancelInternal();
 			return true;
 		}