Remove unnecessary namespace bracketing for an internal nullability macro.

PiperOrigin-RevId: 897160180
Change-Id: I9e82de7c744fc71246aa6b62fd54b2ca4a1a49ac

absl/base/nullability.h

diff --git a/absl/base/nullability.h b/absl/base/nullability.h
index facc642..53aa54f 100644
--- a/absl/base/nullability.h
+++ b/absl/base/nullability.h
@@ -180,6 +180,7 @@
 // `absl_nonnull` is *not guaranteed* to be non-null, and the compiler won't
 // alert or prevent assignment of a `T* absl_nullable` to a `T* absl_nonnull`.
 // ===========================================================================
+// SKIP_ABSL_INLINE_NAMESPACE_CHECK
 #ifndef ABSL_BASE_NULLABILITY_H_
 #define ABSL_BASE_NULLABILITY_H_