kconfig: do not delay the cur_filename update

Currently, cur_filename is updated at the first token of each statement.
However, this seems unnecessary based on my understanding; the parser
can use the same variable as the lexer tracks.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/lexer.l

@@ -274,24 +274,17 @@ repeat:
 	token = yylex1();
 
 	if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
-		if (token == T_EOL) {
+		if (token == T_EOL)
 			/* Do not pass unneeded T_EOL to the parser. */
 			goto repeat;
-		} else {
+		else
 			/*
-			 * For the parser, update file/lineno at the first token
+			 * For the parser, update lineno at the first token
 			 * of each statement. Generally, \n is a statement
 			 * terminator in Kconfig, but it is not always true
 			 * because \n could be escaped by a backslash.
-			 *
-			 * FIXME:
-			 * cur_filename and cur_lineno are used even after
-			 * yyparse(); menu_finalize() calls menu_add_symbol().
-			 * This should be fixed.
 			 */
-			cur_filename = current_file ? current_file->name : "<none>";
 			cur_lineno = yylineno;
-		}
 	}
 
 	if (prev_prev_token == T_EOL && prev_token == T_WORD &&
@@ -407,6 +400,7 @@ void zconf_initscan(const char *name)
 	}
 
 	current_file = file_lookup(name);
+	cur_filename = current_file->name;
 	yylineno = 1;
 }
 
@@ -448,6 +442,7 @@ void zconf_nextfile(const char *name)
 	}
 
 	yylineno = 1;
+	cur_filename = file->name;
 	current_file = file;
 }
 
@@ -456,6 +451,8 @@ static void zconf_endfile(void)
 	struct buffer *tmp;
 
 	current_file = current_file->parent;
+	if (current_file)
+		cur_filename = current_file->name;
 
 	if (!current_buf)
 		return;

scripts/kconfig/parser.y

@@ -488,6 +488,14 @@ void conf_parse(const char *name)
 		yydebug = 1;
 	yyparse();
 
+	/*
+	 * FIXME:
+	 * cur_filename and cur_lineno are used even after yyparse();
+	 * menu_finalize() calls menu_add_symbol(). This should be fixed.
+	 */
+	cur_filename = "<none>";
+	cur_lineno = 0;
+
 	str_printf(&autoconf_cmd,
 		   "\n"
 		   "$(autoconfig): $(deps_config)\n"