encoding.csv: remove unnecessary IError() cast

vlib/encoding/csv/reader.v

@@ -91,7 +91,7 @@ pub fn (mut r Reader) read() ![]string {
 fn (mut r Reader) read_line() !string {
 	// last record
 	if r.row_pos == r.data.len {
-		return IError(&EndOfFileError{})
+		return &EndOfFileError{}
 	}
 	le := if r.is_mac_pre_osx_le { '\r' } else { '\n' }
 	mut i := r.data.index_after(le, r.row_pos)
@@ -103,7 +103,7 @@ fn (mut r Reader) read_line() !string {
 				r.is_mac_pre_osx_le = true
 			} else {
 				// no valid line endings found
-				return IError(&InvalidLineEndingError{})
+				return &InvalidLineEndingError{}
 			}
 		} else {
 			// No line ending on file
@@ -121,10 +121,10 @@ fn (mut r Reader) read_line() !string {
 
 fn (mut r Reader) read_record() ![]string {
 	if r.delimiter == r.comment {
-		return IError(&CommentIsDelimiterError{})
+		return &CommentIsDelimiterError{}
 	}
 	if !valid_delim(r.delimiter) {
-		return IError(&InvalidDelimiterError{})
+		return &InvalidDelimiterError{}
 	}
 	mut need_read := true
 	mut keep_raw := false
@@ -204,7 +204,7 @@ fn (mut r Reader) read_record() ![]string {
 			}
 		}
 		if i <= -1 && fields.len == 0 {
-			return IError(&InvalidDelimiterError{})
+			return &InvalidDelimiterError{}
 		}
 	}
 	return fields

vlib/net/http/request_test.v

@@ -10,7 +10,7 @@ mut:
 
 fn (mut s StringReader) read(mut buf []u8) !int {
 	if s.place >= s.text.len {
-		return IError(io.Eof{})
+		return io.Eof{}
 	}
 	max_bytes := 100
 	end := if s.place + max_bytes >= s.text.len { s.text.len } else { s.place + max_bytes }