Merge "Nullability check for pidfd module" am: 7f8133dc2f

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2478476

Change-Id: I5145cb5986ae49e330e9b83fe93500561d8c6ab4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/libc/include/sys/pidfd.h b/libc/include/sys/pidfd.h
index 6d0e809..30455bb 100644
--- a/libc/include/sys/pidfd.h
+++ b/libc/include/sys/pidfd.h
@@ -71,6 +71,6 @@
  *
  * Available since API level 31.
  */
-int pidfd_send_signal(int __pidfd, int __sig, siginfo_t *__info, unsigned int __flags) __INTRODUCED_IN(31);
+int pidfd_send_signal(int __pidfd, int __sig, siginfo_t * _Nullable __info, unsigned int __flags) __INTRODUCED_IN(31);
 
 __END_DECLS