don't cleanup if we havent used it yet.

Author: RetiredWizard

shared-module/displayio/__init__.c

@@ -254,10 +254,14 @@ void reset_displays(void) {
     common_hal_displayio_release_displays_impl(true);
     #if CIRCUITPY_OS_GETENV && CIRCUITPY_SET_DISPLAY_LIMIT
     // Does this need to be done or does port_free effectively do this?
-    m_del(primary_display_bus_t, display_buses_dyn, (max_allocated_display - CIRCUITPY_DISPLAY_LIMIT));
-    m_del(primary_display_t, displays_dyn, (max_allocated_display - CIRCUITPY_DISPLAY_LIMIT));
-    display_buses_dyn = NULL;
-    displays_dyn = NULL;
+    if (max_allocated_display > CIRCUITPY_DISPLAY_LIMIT) {
+        // Free the dynamically allocated display buses and displays.
+        m_del(primary_display_bus_t, display_buses_dyn, (max_allocated_display - CIRCUITPY_DISPLAY_LIMIT));
+        m_del(primary_display_bus_t, display_buses_dyn, (max_allocated_display - CIRCUITPY_DISPLAY_LIMIT));
+        m_del(primary_display_t, displays_dyn, (max_allocated_display - CIRCUITPY_DISPLAY_LIMIT));
+        display_buses_dyn = NULL;
+        displays_dyn = NULL;
+    }
     // Set dynamically allocated displays to 0 (CIRCUITPY_DISPLAY_LIMIT)
     max_allocated_display = CIRCUITPY_DISPLAY_LIMIT;
     #endif