code review 84750043: net: drop unnecessary nested error notifications

src/pkg/net/sockoptip_bsd.go

Index: src/pkg/net/sockoptip_bsd.go
===================================================================
--- a/src/pkg/net/sockoptip_bsd.go
+++ b/src/pkg/net/sockoptip_bsd.go
@@ -6,15 +6,12 @@
 
 package net
 
-import (
-	"os"
-	"syscall"
-)
+import "syscall"
 
 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
 	ip, err := interfaceToIPv4Addr(ifi)
 	if err != nil {
-		return os.NewSyscallError("setsockopt", err)
+		return err
 	}
 	var a [4]byte
 	copy(a[:], ip.To4())
@@ -22,7 +19,7 @@
 		return err
 	}
 	defer fd.decref()
-	return os.NewSyscallError("setsockopt", syscall.SetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, a))
+	return syscall.SetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, a)
 }
 
 func setIPv4MulticastLoopback(fd *netFD, v bool) error {
@@ -30,5 +27,5 @@
 		return err
 	}
 	defer fd.decref()
-	return os.NewSyscallError("setsockopt", syscall.SetsockoptByte(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, byte(boolint(v))))
+	return syscall.SetsockoptByte(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, byte(boolint(v)))
 }