Revert "Name function arguments in libc headers for Studio."

This reverts commit 079bff4fa52b0c3c76057451cc9cdecf1827fce0.

Broke builds with SANITIZE_HOST=address with an asan failure in versioner.

Change-Id: I22b113fd5405589d1a25e5e137c450aaba1ade5f
diff --git a/libc/include/sys/reg.h b/libc/include/sys/reg.h
index 6c496ba..1066b6d 100644
--- a/libc/include/sys/reg.h
+++ b/libc/include/sys/reg.h
@@ -83,4 +83,4 @@
 
 #endif
 
-#endif
+#endif /* _SYS_REG_H_ */