Somehow we all missed initializing this to false

Implement progress dialog for printing and PP that show before reflow
Bug 154136 r=dcone/sgehani sr=alecf

embedding/components/printingui/src/unixshared/nsPrintingPromptService.cpp

@@ -142,6 +142,8 @@ nsPrintingPromptService::ShowProgress(nsIDOMWindow*            parent,
     NS_ENSURE_ARG(printProgressParams);
     NS_ENSURE_ARG(notifyOnOpen);
 
+    *notifyOnOpen = PR_FALSE;
+
     nsPrintProgress* prtProgress = new nsPrintProgress();
     nsresult rv = prtProgress->QueryInterface(NS_GET_IID(nsIPrintProgress), (void**)getter_AddRefs(mPrintProgress));
     NS_ENSURE_SUCCESS(rv, rv);