bugfix: fixed warning of signed and unsigned.

Signed-off-by: lijunlong <lijunlong@openresty.com>

Author: zhuizhuhaomeng

src/ngx_http_lua_headers.c

@@ -1250,8 +1250,10 @@ ngx_http_lua_ngx_raw_header_cleanup(void *data)
 int
 ngx_http_lua_ffi_set_resp_header_macos(ngx_http_lua_set_resp_header_params_t *p)
 {
-    return ngx_http_lua_ffi_set_resp_header(p->r, p->key_data, p->key_len,
-                                            p->is_nil, p->sval, p->sval_len,
+    return ngx_http_lua_ffi_set_resp_header(p->r, (const u_char *) p->key_data,
+                                            p->key_len, p->is_nil,
+                                            (const u_char *) p->sval,
+                                            p->sval_len,
                                             p->mvals, p->mvals_len,
                                             p->override, p->errmsg);
 }

src/ngx_http_lua_shdict.c

@@ -2096,7 +2096,8 @@ ngx_http_lua_ffi_shdict_free_space(ngx_shm_zone_t *zone)
 int
 ngx_http_lua_ffi_shdict_get_macos(ngx_http_lua_shdict_get_params_t *p)
 {
-    return ngx_http_lua_ffi_shdict_get(p->zone, p->key, p->key_len,
+    return ngx_http_lua_ffi_shdict_get(p->zone,
+                                       (u_char *) p->key, p->key_len,
                                        p->value_type, p->str_value_buf,
                                        p->str_value_len, p->num_value,
                                        p->user_flags, p->get_stale,
@@ -2107,8 +2108,10 @@ ngx_http_lua_ffi_shdict_get_macos(ngx_http_lua_shdict_get_params_t *p)
 int
 ngx_http_lua_ffi_shdict_store_macos(ngx_http_lua_shdict_store_params_t *p)
 {
-    return ngx_http_lua_ffi_shdict_store(p->zone, p->op, p->key, p->key_len,
-                                         p->value_type, p->str_value_buf,
+    return ngx_http_lua_ffi_shdict_store(p->zone, p->op,
+                                         (u_char *) p->key, p->key_len,
+                                         p->value_type,
+                                         (u_char *) p->str_value_buf,
                                          p->str_value_len, p->num_value,
                                          p->exptime, p->user_flags,
                                          p->errmsg, p->forcible);
@@ -2118,7 +2121,7 @@ ngx_http_lua_ffi_shdict_store_macos(ngx_http_lua_shdict_store_params_t *p)
 int
 ngx_http_lua_ffi_shdict_incr_macos(ngx_http_lua_shdict_incr_params_t *p)
 {
-    return ngx_http_lua_ffi_shdict_incr(p->zone, p->key, p->key_len,
+    return ngx_http_lua_ffi_shdict_incr(p->zone, (u_char *) p->key, p->key_len,
                                         p->num_value, p->errmsg,
                                         p->has_init, p->init, p->init_ttl,
                                         p->forcible);