fixes

src/twn_timer.c

@@ -33,7 +33,7 @@ bool start_sanity_timer(uint32_t milliseconds_to_expire) {
 }
 
 
-bool end_sanity_timer(void) {
+void end_sanity_timer(void) {
     SDL_RemoveTimer(sanity_timer);
     sanity_timer = 0;
 }

src/twn_timer_c.h

@@ -5,6 +5,6 @@
 #include <stdint.h>
 
 bool start_sanity_timer(uint32_t milliseconds_to_expire);
-bool end_sanity_timer(void);
+void end_sanity_timer(void);
 
 #endif // TWN_TIMER_H