fix overflow in lv_anim_speed_to_time

lv_misc/lv_anim.c

@@ -115,7 +115,9 @@ bool lv_anim_del(void * var, lv_anim_fp_t fp)
 uint16_t lv_anim_speed_to_time(uint16_t speed, int32_t start, int32_t end)
 {
     int32_t d = LV_MATH_ABS((int32_t) start - end);
-    uint16_t time = (int32_t)((int32_t)(d * 1000) / speed);
+    uint32_t time = (int32_t)((int32_t)(d * 1000) / speed);
+
+    if(time > UINT16_MAX) time = UINT16_MAX;
 
     if(time == 0) {
         time++;

lv_misc/lv_anim.h

@@ -43,7 +43,7 @@ typedef struct _lv_anim_t
 	lv_anim_path_t path;			/*An array with the steps of animations*/
 	int32_t start;					/*Start value*/
 	int32_t end;					/*End value*/
-	int16_t time;					/*Animation time in ms*/
+	uint16_t time;					/*Animation time in ms*/
 	int16_t act_time;				/*Current time in animation. Set to negative to make delay.*/
 	uint16_t playback_pause;		/*Wait before play back*/
 	uint16_t repeat_pause;			/*Wait before repeat*/