Fixing gz snprintf not matching sizes

Provider/main/http_server.cpp

@@ -14,6 +14,8 @@
 
 internal const char *TAG = "HTTP_SERVER";
 
+constexpr uint8 kGZ_Extension_Length = sizeof(".gz") - 1;
+
 #define FILE_PATH_MAX (ESP_VFS_PATH_MAX + 128)
 #define SCRATCH_BUFSIZE 4096
 
@@ -58,7 +60,7 @@ internal esp_err_t static_file_handler(httpd_req_t *req) {
   struct stat file_stat;
   if (stat(filepath, &file_stat) == -1) {
     // Try gzipped first, then fallback to index.html
-    char filepath_gz[FILE_PATH_MAX + 16];
+    char filepath_gz[FILE_PATH_MAX + kGZ_Extension_Length];
     snprintf(filepath_gz, sizeof(filepath_gz), "%s.gz", filepath);
     if (stat(filepath_gz, &file_stat) == 0) {
       strlcpy(filepath, filepath_gz, sizeof(filepath));