UI, libobs: Fix compiler warnings

UI/window-basic-preview.cpp

@@ -650,13 +650,15 @@ void OBSBasicPreview::mouseReleaseEvent(QMouseEvent *event)
 
 			std::lock_guard<std::mutex> lock(selectMutex);
 			if (altDown || ctrlDown || shiftDown) {
-				for (int i = 0; i < selectedItems.size(); i++) {
+				for (size_t i = 0; i < selectedItems.size();
+				     i++) {
 					obs_sceneitem_select(selectedItems[i],
 							     true);
 				}
 			}
 
-			for (int i = 0; i < hoveredPreviewItems.size(); i++) {
+			for (size_t i = 0; i < hoveredPreviewItems.size();
+			     i++) {
 				bool select = true;
 				obs_sceneitem_t *item = hoveredPreviewItems[i];
 
@@ -1677,7 +1679,7 @@ bool OBSBasicPreview::DrawSelectedItem(obs_scene_t *scene,
 	bool hovered = false;
 	{
 		std::lock_guard<std::mutex> lock(prev->selectMutex);
-		for (int i = 0; i < prev->hoveredPreviewItems.size(); i++) {
+		for (size_t i = 0; i < prev->hoveredPreviewItems.size(); i++) {
 			if (prev->hoveredPreviewItems[i] == item) {
 				hovered = true;
 				break;

libobs/obs.c

@@ -139,6 +139,8 @@ static bool obs_init_gpu_conversion(struct obs_video_info *ovi)
 			if (!video->convert_textures[2])
 				return false;
 			break;
+		default:
+			break;
 		}
 #ifdef _WIN32
 	}
@@ -190,6 +192,8 @@ static bool obs_init_gpu_copy_surfaces(struct obs_video_info *ovi, size_t i)
 		if (!video->copy_surfaces[i][2])
 			return false;
 		break;
+	default:
+		break;
 	}
 
 	return true;