[lsan] Fix typo in stale_stack_leak.cc testcase
// RUN: LSAN_OPTIONS=$LSAN_BASE":exitcode=0" %run %t 2>&1 | FileCheck --check-prefix=CHECK-sanity %s
//
// x86 passes parameters through stack that may lead to false negatives
-// UNSPPORTED: x86
+// UNSUPPORTED: x86
#include <stdio.h>
#include <stdlib.h>
