Remove redundant get() call on std::shared_ptr

Also fix them.
- replaces reference-type of std::shared_ptr with the base pointer type
  for readability.
- Fix `return NULL` where it should be `return false`.

src/face-tracker-ptz.cpp

@@ -900,7 +900,7 @@ static inline bool operator != (const struct video_scale_info &a, const struct v
 	return false;
 }
 
-static bool scale_set_texture(struct face_tracker_ptz *s, std::shared_ptr<texture_object> &cvtex, struct obs_source_frame *frame)
+static bool scale_set_texture(struct face_tracker_ptz *s, texture_object *cvtex, struct obs_source_frame *frame)
 {
 	const struct video_scale_info scaler_src_info = {
 		frame->format,
@@ -946,10 +946,10 @@ static bool scale_set_texture(struct face_tracker_ptz *s, std::shared_ptr<textur
 
 	if (!video_scaler_scale(s->scaler, scaled_frame.data, scaled_frame.linesize, frame->data, frame->linesize)) {
 		blog(LOG_ERROR, "video_scaler_scale failed");
-		return NULL;
+		return false;
 	}
 
-	cvtex.get()->set_texture_obsframe(&scaled_frame, 1);
+	cvtex->set_texture_obsframe(&scaled_frame, 1);
 	return true;
 }
 
@@ -961,13 +961,14 @@ static struct obs_source_frame *ftptz_filter_video(void *data, struct obs_source
 	auto *s = (struct face_tracker_ptz*)data;
 
 	std::shared_ptr<texture_object> cvtex(new texture_object());
-	cvtex.get()->scale = s->ftm->scale;
-	cvtex.get()->tick = s->ftm->tick_cnt;
+	cvtex->scale = s->ftm->scale;
+	cvtex->tick = s->ftm->tick_cnt;
 
 	if (is_rgb_format(frame->format)) {
-		cvtex.get()->set_texture_obsframe(frame, s->ftm->scale);
+		cvtex->set_texture_obsframe(frame, s->ftm->scale);
 	} else {
-		scale_set_texture(s, cvtex, frame);
+		if (!scale_set_texture(s, cvtex.get(), frame))
+			return frame;
 	}
 
 	s->known_width = frame->width;

src/face-tracker.cpp

@@ -742,8 +742,8 @@ static inline std::shared_ptr<texture_object> surface_to_cvtex(struct face_track
 	uint32_t height = gs_stagesurface_get_height(s->stagesurface);
 
 	std::shared_ptr<texture_object> cvtex(new texture_object);
-	cvtex.get()->scale = scale;
-	cvtex.get()->tick = s->ftm->tick_cnt;
+	cvtex->scale = scale;
+	cvtex->tick = s->ftm->tick_cnt;
 
 	struct obs_source_frame frame;
 	memset(&frame, 0, sizeof(frame));
@@ -752,7 +752,7 @@ static inline std::shared_ptr<texture_object> surface_to_cvtex(struct face_track
 	frame.width = width;
 	frame.height = height;
 	frame.format = VIDEO_FORMAT_BGRA;
-	cvtex.get()->set_texture_obsframe(&frame, 1);
+	cvtex->set_texture_obsframe(&frame, 1);
 
 	gs_stagesurface_unmap(s->stagesurface);