minor cleanups

src/mtsgui/main.cpp

@@ -159,13 +159,6 @@ public:
 	}
 };
 
-/* Collect zombie processes */
-#if !defined(__WINDOWS__)
-void collect_zombies(int s) {
-	while (waitpid(-1, NULL, WNOHANG) > 0);
-}
-#endif
-
 #if defined(__OSX__)
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif

src/mtsgui/mainwindow.cpp

@@ -690,7 +690,7 @@ retry:
 				ret = QMessageBox::question(this, tr("Version mismatch -- update scene file?"),
 					QString("The requested scene file is from an older version of Mitsuba "
 						"(%1). To work with version %2, it will need to be updated. If you "
-						"continue, Mitsuba will perform a fully automated upgrade (note that a "
+						"continue, Mitsuba will perform a fully automated upgrade (a "
 						"backup copy will be made).\n\nProceed?")
 						.arg(version.toString().c_str())
 						.arg(MTS_VERSION), QMessageBox::Yes | QMessageBox::Cancel);