SDL: testcontroller: Fix crash when unplugging a controller while calibrating gyro

SDL Commits
1 
From 4037c258a1e53d007582eca2a743e87e1c680aa2 Mon Sep 17 00:00:00 2001
From: Vicki Pfau <[EMAIL REDACTED]>
Date: Wed, 22 Oct 2025 18:03:21 -0700
Subject: [PATCH] testcontroller: Fix crash when unplugging a controller while
 calibrating gyro

---
 test/testcontroller.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/testcontroller.c b/test/testcontroller.c
index a68ef107d0238..345b712ef40a1 100644
--- a/test/testcontroller.c
+++ b/test/testcontroller.c
@@ -2208,9 +2208,9 @@ SDL_AppResult SDLCALL SDL_AppEvent(void *appstate, SDL_Event *event)
         }
 
         if (display_mode == CONTROLLER_MODE_TESTING) {
-            if (GamepadButtonContains(GetGyroResetButton(gyro_elements), event->button.x, event->button.y)) {
+            if (controller && GamepadButtonContains(GetGyroResetButton(gyro_elements), event->button.x, event->button.y)) {
                 ResetGyroOrientation(controller->imu_state);
-            } else if (GamepadButtonContains(GetGyroCalibrateButton(gyro_elements), event->button.x, event->button.y)) {
+            } else if (controller && GamepadButtonContains(GetGyroCalibrateButton(gyro_elements), event->button.x, event->button.y)) {
                 BeginNoiseCalibrationPhase(controller->imu_state);
             } else if (GamepadButtonContains(setup_mapping_button, event->button.x, event->button.y)) {
                 SetDisplayMode(CONTROLLER_MODE_BINDING);