diff --git a/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go b/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go
index 8ed1d54..87a3074 100644
--- a/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go
+++ b/vendor/golang.org/x/sys/unix/syscall_linux_amd64.go
@@ -55,8 +55,8 @@
 }
 
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	setfsgid(gid int) (prev int, err error)
-//sys	setfsuid(uid int) (prev int, err error)
+//sys	Setfsgid(gid int) (err error)
+//sys	Setfsuid(uid int) (err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
@@ -163,10 +163,6 @@
 	msghdr.Controllen = uint64(length)
 }
 
-func (msghdr *Msghdr) SetIovlen(length int) {
-	msghdr.Iovlen = uint64(length)
-}
-
 func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint64(length)
 }