big picture: lock reload mutex at function entry

Author: Megamouse

rpcs3/Emu/RSX/Overlays/BigPicture/overlay_big_picture_game_grid.cpp

@@ -391,6 +391,8 @@ namespace rsx
 
 		compiled_resource& big_picture_game_grid::get_compiled()
 		{
+			std::lock_guard lock(m_reload_mutex);
+
 			if (!m_highlight->is_compiled() ||
 				(!m_tiles.empty() && m_grid && !m_grid->is_compiled()) ||
 				(m_details && m_details->is_visible()))
@@ -411,8 +413,6 @@ namespace rsx
 				return compiled_resources;
 			}
 
-			std::lock_guard lock(m_reload_mutex);
-
 			if (m_tiles.empty())
 			{
 				compiled_resources.add(m_placeholder_text->get_compiled());