fix more sanitizer complaint

CMakeLists.txt

@@ -1,4 +1,6 @@
 #note: experimental
+#      currently only used for generating `compile_commands.json` for clangd
+#      to build this project, it's suggested to use `makefile` instead
 
 cmake_minimum_required(VERSION 3.7)
 project(speederv2)

ISSUE_TEMPLATE.md

@@ -1 +1 @@
-English Only (except for bug reporting).
+English Only.

common.cpp

@@ -895,8 +895,8 @@ int new_connected_socket2(int &fd, address_t &addr, address_t *bind_addr, char *
 u32_t djb2(unsigned char *str, int len) {
     u32_t hash = 5381;
     int c;
-    int i = 0;
-    while (c = *str++, i++ != len) {
+    for (int i=0; i<len ;i++) {
+        c = *(str++);
         hash = ((hash << 5) + hash) ^ c; /* (hash * 33) ^ c */
     }
 
@@ -907,14 +907,15 @@ u32_t djb2(unsigned char *str, int len) {
 u32_t sdbm(unsigned char *str, int len) {
     u32_t hash = 0;
     int c;
-    int i = 0;
-    while (c = *str++, i++ != len) {
+    for (int i=0; i<len ;i++) {
+        c = *(str++);
         hash = c + (hash << 6) + (hash << 16) - hash;
     }
     // hash=htonl(hash);
     return hash;
 }
 
+
 vector<string> string_to_vec(const char *s, const char *sp) {
     vector<string> res;
     string str = s;

fec_manager.h

@@ -413,7 +413,7 @@ class fec_decode_manager_t : not_copy_able_t {
         mylog(log_debug, "fec_decode_manager destroyed\n");
         if (fec_data != 0) {
             mylog(log_debug, "fec_data freed\n");
-            delete fec_data;
+            delete[] fec_data;
         }
     }
     int clear() {