event/Thread, ...: fix printf->libfmt remains

src/output/Thread.cxx

@@ -435,7 +435,7 @@ AudioOutputControl::Task() noexcept
 		SetThreadRealtime();
 	} catch (...) {
 		FmtInfo(output_domain,
-			"OutputThread could not get realtime scheduling, continuing anyway: %s",
+			"OutputThread could not get realtime scheduling, continuing anyway: {}",
 			std::current_exception());
 	}
 

src/output/plugins/FifoOutputPlugin.cxx

@@ -195,7 +195,7 @@ FifoOutput::Cancel() noexcept
 
 	if (bytes < 0 && errno != EAGAIN) {
 		FmtError(fifo_output_domain,
-			 "Flush of FIFO \"{}\" failed: %s",
+			 "Flush of FIFO \"{}\" failed: {}",
 			 path_utf8, strerror(errno));
 	}
 }