all: remove unnecessary IError() casts

vlib/net/http/header.v

@@ -645,19 +645,19 @@ pub fn (err HeaderKeyError) code() int {
 fn is_valid(header string) ! {
 	for _, c in header {
 		if int(c) >= 128 || !is_token(c) {
-			return IError(HeaderKeyError{
+			return HeaderKeyError{
 				code: 1
 				header: header
 				invalid_char: c
-			})
+			}
 		}
 	}
 	if header.len == 0 {
-		return IError(HeaderKeyError{
+		return HeaderKeyError{
 			code: 2
 			header: header
 			invalid_char: 0
-		})
+		}
 	}
 }
 

vlib/net/mbedtls/ssl_connection.v

@@ -223,7 +223,7 @@ pub fn (mut s SSLConn) socket_read_into_ptr(buf_ptr &u8, len int) !int {
 		if res > 0 {
 			return res
 		} else if res == 0 {
-			return IError(io.Eof{})
+			return io.Eof{}
 		} else {
 			match res {
 				C.MBEDTLS_ERR_SSL_WANT_READ {

vlib/net/openssl/ssl_connection.v

@@ -274,7 +274,7 @@ pub fn (mut s SSLConn) socket_read_into_ptr(buf_ptr &u8, len int) !int {
 		if res > 0 {
 			return res
 		} else if res == 0 {
-			return IError(io.Eof{})
+			return io.Eof{}
 		} else {
 			err_res := ssl_error(res, s.ssl)!
 			match err_res {

vlib/net/tcp.v

@@ -135,10 +135,10 @@ pub fn (c TcpConn) read_ptr(buf_ptr &u8, len int) !int {
 
 pub fn (c TcpConn) read(mut buf []u8) !int {
 	return c.read_ptr(buf.data, buf.len) or {
-		return IError(io.NotExpected{
+		return io.NotExpected{
 			cause: 'unexpected error in `read_ptr` function'
 			code: -1
-		})
+		}
 	}
 }