image: Free filename saved into structure on error path

clients/image.c

@@ -373,6 +373,7 @@ image_create(struct display *display, const char *filename,
 
 	if (!image->image) {
 		fprintf(stderr, "could not find the image %s!\n", b);
+		free(image->filename);
 		free(image);
 		return NULL;
 	}