freertos/timer: fix the static timer creation

Removes the not used spinlock field inside timer object which was causing assertion fail

components/freertos/include/freertos/FreeRTOS.h

@@ -1274,9 +1274,6 @@ typedef struct xSTATIC_TIMER
 		UBaseType_t		uxDummy7;
 	#endif
 	uint8_t 			ucDummy8;
-
-	portMUX_TYPE 		xDummy9;
-
 } StaticTimer_t;
 
 /*

components/freertos/test/test_timers.c

@@ -68,3 +68,20 @@ TEST_CASE("Recurring FreeRTOS timers", "[freertos]")
 
     TEST_ASSERT( xTimerDelete(recurring, 1) );
 }
+
+#ifdef CONFIG_FREERTOS_SUPPORT_STATIC_ALLOCATION
+TEST_CASE("Static timer creation", "[freertos]")
+{
+    StaticTimer_t static_timer;
+    TimerHandle_t created_timer;
+    volatile int count = 0;
+
+    created_timer = xTimerCreateStatic("oneshot", 100 / portTICK_PERIOD_MS, 
+                                    pdTRUE,
+                                    (void *)&count, 
+                                    timer_callback, 
+                                    &static_timer);
+    
+    TEST_ASSERT_NOT_NULL(created_timer);
+}
+#endif