Fix -Werror=stringop-truncation build failure in fileutils.c

Author: AlxCzl

client/src/fileutils.c

@@ -3036,9 +3036,7 @@ static int filelist(const char *path, const char *ext, uint8_t last, bool tentat
     for (int i = 0; i < n; i++) {
 
         char tmp_fullpath[1024] = {0};
-        strncat(tmp_fullpath, path, sizeof(tmp_fullpath) - 1);
-        tmp_fullpath[1023] = 0x00;
-        strncat(tmp_fullpath, namelist[i]->d_name, strlen(tmp_fullpath) - 1);
+        snprintf(tmp_fullpath, sizeof(tmp_fullpath), "%s%s", path, namelist[i]->d_name);
 
         if (path_is_directory(tmp_fullpath)) {