obs-filters: Misc code cleanups detected by PVS Studio

plugins/obs-filters/compressor-filter.c

@@ -410,8 +410,7 @@ static void compressor_tick(void *data, float seconds)
 
 	if (new_name) {
 		obs_source_t *sidechain =
-			new_name && *new_name ? obs_get_source_by_name(new_name)
-					      : NULL;
+			*new_name ? obs_get_source_by_name(new_name) : NULL;
 		obs_weak_source_t *weak_sidechain =
 			sidechain ? obs_source_get_weak_source(sidechain)
 				  : NULL;

plugins/obs-filters/crop-filter.c

@@ -160,12 +160,12 @@ static void calc_crop_dimensions(struct crop_filter_data *filter,
 	if (filter->height < 1)
 		filter->height = 1;
 
-	if (width && filter->width) {
+	if (width) {
 		mul_val->x = (float)filter->width / (float)width;
 		add_val->x = (float)filter->left / (float)width;
 	}
 
-	if (height && filter->height) {
+	if (height) {
 		mul_val->y = (float)filter->height / (float)height;
 		add_val->y = (float)filter->top / (float)height;
 	}

plugins/obs-filters/scale-filter.c

@@ -195,9 +195,7 @@ static void scale_filter_tick(void *data, float seconds)
 		} else {
 			if (new_aspect > old_aspect) {
 				filter->cx_out = (int)(cy_f * new_aspect);
-				filter->cy_out = cy;
 			} else {
-				filter->cx_out = cx;
 				filter->cy_out = (int)(cx_f / new_aspect);
 			}
 		}