Implement initial close function

src/minivhd_manage.c

@@ -111,4 +111,8 @@ cleanup_vhdm:
     vhdm = NULL;
 end:
     return vhdm;
+}
+
+void mvhd_close(MVHDMeta* vhdm) {
+    fclose(vhdm->f);
 }

test_program/minivhd_test.c

@@ -9,5 +9,6 @@ int main(int argc, char* argv[]) {
     char* path = argv[1];
     int err;
     MVHDMeta* vhdm = mvhd_open(path, &err);
+    mvhd_close(vhdm);
     return 0;
 }