fetch: close downloaded file. unlink on failure

src/fetch.c

@@ -95,9 +95,12 @@ static int fetch_package(struct fetch_ctx *fctx,
 	}
 
 	r = apk_istream_splice(is, fd, pkg->size, NULL, NULL);
+	if (fd != STDOUT_FILENO)
+		close(fd);
 	if (r != pkg->size) {
 		is->close(is);
 		apk_error("Unable to download '%s'", file);
+		unlink(file);
 		return -1;
 	}