Assigning NULL to an integer triggers -Wconversion-null.

--- a/src/bar/Bar.cpp
+++ b/src/bar/Bar.cpp
@@ -246,7 +246,7 @@
 
     Debug::log(LOG, "Tray setup done, sending message!");
 
-    uint8_t buf[32] = {NULL};
+    uint8_t buf[32] = {0};
     xcb_client_message_event_t* event = (xcb_client_message_event_t*)buf;
 
     event->response_type = XCB_CLIENT_MESSAGE;
--- a/src/events/events.cpp
+++ b/src/events/events.cpp
@@ -278,7 +278,7 @@
     //
     const auto wm_type_cookie = xcb_get_property(g_pWindowManager->DisplayConnection, false, windowID, HYPRATOMS["_NET_WM_WINDOW_TYPE"], XCB_GET_PROPERTY_TYPE_ANY, 0, (4294967295U));
     const auto wm_type_cookiereply = xcb_get_property_reply(g_pWindowManager->DisplayConnection, wm_type_cookie, NULL);
-    xcb_atom_t TYPEATOM = NULL;
+    xcb_atom_t TYPEATOM = 0;
     if (wm_type_cookiereply == NULL || xcb_get_property_value_length(wm_type_cookiereply) < 1) {
         Debug::log(LOG, "No preferred type found. (RemapFloatingWindow)");
     } else {
@@ -918,7 +918,7 @@
 
 
             // Notify the thing we did it
-            uint8_t buf[32] = {NULL};
+            uint8_t buf[32] = {0};
             xcb_client_message_event_t* event = (xcb_client_message_event_t*)buf;
             event->response_type = XCB_CLIENT_MESSAGE;
             event->window = CLIENT;