tests: debug output on LibGoalFixture failure (#6026)

test/framework/fixtures/libgoalFixture.go

@@ -144,20 +144,23 @@ func (f *LibGoalFixture) nodeExitWithError(nc *nodecontrol.NodeController, err e
 		return
 	}
 
-	defer func() {
+	debugLog := func() {
 		f.t.Logf("Node at %s has terminated with an error: %v. Dumping logs...", nc.GetDataDir(), err)
 		f.dumpLogs(filepath.Join(nc.GetDataDir(), "node.log"))
-	}()
+	}
 
 	exitError, ok := err.(*exec.ExitError)
 	if !ok {
-		require.NoError(f.t, err, "Node at %s has terminated with an error", nc.GetDataDir())
+		debugLog()
+		require.NoError(f.t, err)
 		return
 	}
 	ws := exitError.Sys().(syscall.WaitStatus)
 	exitCode := ws.ExitStatus()
 
-	require.NoError(f.t, err, "Node at %s has terminated with error code %d", nc.GetDataDir(), exitCode)
+	f.t.Logf("Node at %s has terminated with error code %d (%v)", nc.GetDataDir(), exitCode, *exitError)
+	debugLog()
+	require.NoError(f.t, err)
 }
 
 func (f *LibGoalFixture) importRootKeys(lg *libgoal.Client, dataDir string) {