httpd: follow-up to previous commit

see bug #59876

contrib/examples/httpd/genfiles_example/genfiles_example.c

@@ -57,6 +57,9 @@
 #if !LWIP_HTTPD_CUSTOM_FILES
 #error This needs LWIP_HTTPD_CUSTOM_FILES
 #endif
+#if !LWIP_HTTPD_FILE_EXTENSION
+#error This needs LWIP_HTTPD_FILE_EXTENSION
+#endif
 #if !LWIP_HTTPD_DYNAMIC_HEADERS
 #error This needs LWIP_HTTPD_DYNAMIC_HEADERS
 #endif

src/apps/http/fs.c

@@ -74,7 +74,6 @@ fs_open(struct fs_file *file, const char *name)
       file->data = (const char *)f->data;
       file->len = f->len;
       file->index = f->len;
-      file->pextension = NULL;
       file->flags = f->flags;
 #if HTTPD_PRECALCULATED_CHECKSUM
       file->chksum_count = f->chksum_count;