Fix leak of out_buf when file length is zero.

src/bcast/file_bcast.c

@@ -507,12 +507,13 @@ static int _decompress_data_zlib(file_bcast_msg_t *req)
 static int _decompress_data_lz4(file_bcast_msg_t *req)
 {
 #if HAVE_LZ4
-	char *out_buf = xmalloc(req->uncomp_len);
+	char *out_buf;
 	int out_len;
 
 	if (!req->block_len)
 		return 0;
 
+	out_buf = xmalloc(req->uncomp_len);
 	out_len = LZ4_decompress_safe(req->block, out_buf, req->block_len, req->uncomp_len);
 	xfree(req->block);
 	req->block = out_buf;