unix: use Go 1.21+ clear built-in

Inspired by CL 698495.

Change-Id: Ic6ff68a60d41b6ffb6a28f523597c5d36c1e4d2f
Reviewed-on: https://go-review.googlesource.com/c/sys/+/704915
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Mark Freeman <markfreeman@google.com>

unix/fdset.go

diff --git a/unix/fdset.go b/unix/fdset.go
index 9e83d18..62ed126 100644
--- a/unix/fdset.go
+++ b/unix/fdset.go
@@ -23,7 +23,5 @@
 
 // Zero clears the set fds.
 func (fds *FdSet) Zero() {
-	for i := range fds.Bits {
-		fds.Bits[i] = 0
-	}
+	clear(fds.Bits[:])
 }

unix/ifreq_linux.go

diff --git a/unix/ifreq_linux.go b/unix/ifreq_linux.go
index 848840a..309f5a2 100644
--- a/unix/ifreq_linux.go
+++ b/unix/ifreq_linux.go
@@ -111,9 +111,7 @@
 // clear zeroes the ifreq's union field to prevent trailing garbage data from
 // being sent to the kernel if an ifreq is reused.
 func (ifr *Ifreq) clear() {
-	for i := range ifr.raw.Ifru {
-		ifr.raw.Ifru[i] = 0
-	}
+	clear(ifr.raw.Ifru[:])
 }
 
 // TODO(mdlayher): export as IfreqData? For now we can provide helpers such as

unix/syscall_linux.go

diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go
index 4958a65..9439af9 100644
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go
@@ -801,9 +801,7 @@
 	// one. The kernel expects SID to be in network byte order.
 	binary.BigEndian.PutUint16(sa.raw[6:8], sa.SID)
 	copy(sa.raw[8:14], sa.Remote)
-	for i := 14; i < 14+IFNAMSIZ; i++ {
-		sa.raw[i] = 0
-	}
+	clear(sa.raw[14 : 14+IFNAMSIZ])
 	copy(sa.raw[14:], sa.Dev)
 	return unsafe.Pointer(&sa.raw), SizeofSockaddrPPPoX, nil
 }