net: don't return errno from _C_res_nsearch

We ignore the value anyhow.

Change-Id: I1b1db7831c42bf852652236212812fd5cf258530
Reviewed-on: https://go-review.googlesource.com/c/go/+/457439
Reviewed-by: Damien Neil <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: ianlancetaylor

src/net/cgo_unix.go

@@ -352,7 +352,7 @@ func cgoResSearch(hostname string, rtype, class int) ([]dnsmessage.Resource, err
 
 	var size int
 	for {
-		size, _ = _C_res_nsearch(state, (*_C_char)(unsafe.Pointer(s)), class, rtype, buf, bufSize)
+		size := _C_res_nsearch(state, (*_C_char)(unsafe.Pointer(s)), class, rtype, buf, bufSize)
 		if size <= 0 || size > 0xffff {
 			return nil, errors.New("res_nsearch failure")
 		}

src/net/cgo_unix_cgo_res.go

@@ -32,7 +32,7 @@ func _C_res_nclose(state *_C_struct___res_state) {
 	return
 }
 
-func _C_res_nsearch(state *_C_struct___res_state, dname *_C_char, class, typ int, ans *_C_uchar, anslen int) (int, error) {
-	x, err := C.res_search(dname, C.int(class), C.int(typ), ans, C.int(anslen))
-	return int(x), err
+func _C_res_nsearch(state *_C_struct___res_state, dname *_C_char, class, typ int, ans *_C_uchar, anslen int) int {
+	x := C.res_search(dname, C.int(class), C.int(typ), ans, C.int(anslen))
+	return int(x)
 }

src/net/cgo_unix_cgo_resn.go

@@ -33,7 +33,7 @@ func _C_res_nclose(state *_C_struct___res_state) {
 	C.res_nclose(state)
 }
 
-func _C_res_nsearch(state *_C_struct___res_state, dname *_C_char, class, typ int, ans *_C_uchar, anslen int) (int, error) {
-	x, err := C.res_nsearch(state, dname, C.int(class), C.int(typ), ans, C.int(anslen))
-	return int(x), err
+func _C_res_nsearch(state *_C_struct___res_state, dname *_C_char, class, typ int, ans *_C_uchar, anslen int) int {
+	x := C.res_nsearch(state, dname, C.int(class), C.int(typ), ans, C.int(anslen))
+	return int(x)
 }

src/net/cgo_unix_syscall.go

@@ -73,8 +73,9 @@ func _C_res_ninit(state *_C_struct___res_state) error {
 	return nil
 }
 
-func _C_res_nsearch(state *_C_struct___res_state, dname *_C_char, class, typ int, ans *_C_char, anslen int) (int, error) {
-	return unix.ResNsearch(state, dname, class, typ, ans, anslen)
+func _C_res_nsearch(state *_C_struct___res_state, dname *_C_char, class, typ int, ans *_C_char, anslen int) int {
+	x, _ := unix.ResNsearch(state, dname, class, typ, ans, anslen)
+	return x
 }
 
 func _C_res_nclose(state *_C_struct___res_state) {