o Yacc's lineno variable holds a total number of parsed lines.

Reset it to 1 for each devd config file so if the parser finds
a syntax error devd(8) will report a correct line number.

Submitted by:	Niki Denev
MFC after:	2 weeks

sbin/devd/devd.cc

@@ -311,6 +311,7 @@ config::parse_one_file(const char *fn)
 	yyin = fopen(fn, "r");
 	if (yyin == NULL)
 		err(1, "Cannot open config file %s", fn);
+	lineno = 1;
 	if (yyparse() != 0)
 		errx(1, "Cannot parse %s at line %d", fn, lineno);
 	fclose(yyin);