libobs: Merge `obs_encoder_stop()` and `..._stop_internal()`

There is no longer any need for them to be separate functions. This is
just code cleanup.

libobs/obs-encoder.c

@@ -786,14 +786,19 @@ void obs_encoder_start(obs_encoder_t *encoder,
 	pthread_mutex_unlock(&encoder->init_mutex);
 }
 
-static inline void obs_encoder_stop_internal(
-	obs_encoder_t *encoder,
-	void (*new_packet)(void *param, struct encoder_packet *packet),
-	void *param)
+void obs_encoder_stop(obs_encoder_t *encoder,
+		      void (*new_packet)(void *param,
+					 struct encoder_packet *packet),
+		      void *param)
 {
 	bool last = false;
 	size_t idx;
 
+	if (!obs_encoder_valid(encoder, "obs_encoder_stop"))
+		return;
+	if (!obs_ptr_valid(new_packet, "obs_encoder_stop"))
+		return;
+
 	pthread_mutex_lock(&encoder->init_mutex);
 	pthread_mutex_lock(&encoder->callbacks_mutex);
 
@@ -835,21 +840,6 @@ static inline void obs_encoder_stop_internal(
 	pthread_mutex_unlock(&encoder->init_mutex);
 }
 
-void obs_encoder_stop(obs_encoder_t *encoder,
-		      void (*new_packet)(void *param,
-					 struct encoder_packet *packet),
-		      void *param)
-{
-	bool destroyed;
-
-	if (!obs_encoder_valid(encoder, "obs_encoder_stop"))
-		return;
-	if (!obs_ptr_valid(new_packet, "obs_encoder_stop"))
-		return;
-
-	obs_encoder_stop_internal(encoder, new_packet, param);
-}
-
 const char *obs_encoder_get_codec(const obs_encoder_t *encoder)
 {
 	return obs_encoder_valid(encoder, "obs_encoder_get_codec")