syscall: make signature of Umask on OS X, FreeBSD match Linux.
R=rsc
CC=golang-dev
https://golang.org/cl/207071
diff --git a/src/pkg/syscall/syscall_darwin.go b/src/pkg/syscall/syscall_darwin.go
index 1946ecd..291ea55 100644
--- a/src/pkg/syscall/syscall_darwin.go
+++ b/src/pkg/syscall/syscall_darwin.go
@@ -552,7 +552,7 @@
//sys Symlink(path string, link string) (errno int)
//sys Sync() (errno int)
//sys Truncate(path string, length int64) (errno int)
-//sys Umask(newmask int) (errno int)
+//sys Umask(newmask int) (oldmask int)
//sys Undelete(path string) (errno int)
//sys Unlink(path string) (errno int)
//sys Unmount(path string, flags int) (errno int)
