[sanitizer] use the right type for sizeof for interceptor hook

[yingcong-wu]

Summary

PRE_READ is called with a pointer and the size of the object
the pointer points to. But there is one line of code not calling
PRE_READ correctly(likely missing a dereference).
This patch fixes the problem.

[MaskRay]

Thanks!

[yingcong-wu]

Hi @MaskRay, I don't have commit access, could you please help commit this patch?

[yingcong-wu]

Kindly ping @MaskRay , could you help land this patch? Thanks.

compiler-rt/lib/sanitizer_common/sanitizer_common_syscalls.inc

const void *sigmask, long sigsetsize) {
   }
 }
 
 PRE_SYSCALL(epoll_pwait2)
 (long epfd, void *events, long maxevents,
  const sanitizer_kernel_timespec *timeout, const kernel_sigset_t *sigmask,
  long sigsetsize) {
   if (timeout)
-    PRE_READ(timeout, sizeof(timeout));
+    PRE_READ(timeout, sizeof(*timeout));
   if (sigmask)
     PRE_READ(sigmask, sigsetsize);
 }
 
 POST_SYSCALL(epoll_pwait2)
 (long res, long epfd, void *events, long maxevents,
  const sanitizer_kernel_timespec *timeout, const void *sigmask,
  long sigsetsize) {