Fix incorrect array length calculation + add temporary variable to work around egcs compiler bug which was causing bogus text to appear in the LDAP auth dialog on linux (bug 148897); r=bryner@netscape.com, sr=bienvenu@netscape.com

mailnews/addrbook/src/nsAbLDAPDirectoryQuery.cpp

@@ -315,14 +315,20 @@ NS_IMETHODIMP nsAbQueryLDAPMessageListener::OnLDAPInit(nsresult aStatus)
         if (NS_FAILED(rv)) {
             return NS_ERROR_FAILURE;
         }
-        const PRUnichar *hostArray[1] = { NS_ConvertASCIItoUCS2(host).get() };
+
+        // hostTemp is only necessary to work around a code-generation 
+        // bug in egcs 1.1.2 (the version of gcc that comes with Red Hat 6.2),
+        // which is the default compiler for Mozilla on linux at the moment.
+        //
+        NS_ConvertASCIItoUCS2 hostTemp(host);
+        const PRUnichar *hostArray[1] = { hostTemp.get() };
 
         // format the hostname into the authprompt text string
         //
         nsXPIDLString authPromptText;
         rv = ldapBundle->FormatStringFromName(
             NS_LITERAL_STRING("authPromptText").get(),
-            hostArray, sizeof(hostArray),
+            hostArray, sizeof(hostArray) / sizeof(const PRUnichar *),
             getter_Copies(authPromptText));
         if (NS_FAILED(rv)) {
             NS_ERROR("nsAbQueryLDAPMessageListener::OnLDAPInit():"