Partition, ...: use libfmt for logging

src/output/Control.cxx

@@ -20,6 +20,8 @@
 #include "Control.hxx"
 #include "Filtered.hxx"
 #include "Client.hxx"
+#include "Domain.hxx"
+#include "lib/fmt/ExceptionFormatter.hxx"
 #include "mixer/MixerControl.hxx"
 #include "config/Block.hxx"
 #include "Log.hxx"
@@ -286,9 +288,9 @@ AudioOutputControl::Open(std::unique_lock<Mutex> &lock,
 		try {
 			mixer_open(output->mixer);
 		} catch (...) {
-			FormatError(std::current_exception(),
-				    "Failed to open mixer for '%s'",
-				    GetName());
+			FmtError(output_domain,
+				 "Failed to open mixer for '{}': {}",
+				 GetName(), std::current_exception());
 		}
 	}