{input,output}/alsa: fix gcc 7.0 -Wimplicit-fallthrough

src/input/plugins/AlsaInputPlugin.cxx

@@ -247,6 +247,10 @@ AlsaInputStream::Recover(int err)
 	case -EPIPE:
 		LogDebug(alsa_input_domain, "Buffer Overrun");
 		// drop through
+#if GCC_CHECK_VERSION(7,0)
+		[[fallthrough]];
+#endif
+
 	case -ESTRPIPE:
 	case -EINTR:
 		err = snd_pcm_recover(capture_handle, err, 1);

src/output/plugins/AlsaOutputPlugin.cxx

@@ -760,6 +760,9 @@ alsa_recover(AlsaOutput *ad, int err)
 		if (err == -EAGAIN)
 			return 0;
 		/* fall-through to snd_pcm_prepare: */
+#if GCC_CHECK_VERSION(7,0)
+		[[fallthrough]];
+#endif
 	case SND_PCM_STATE_SETUP:
 	case SND_PCM_STATE_XRUN:
 		ad->period_position = 0;