Return error code from parser on normal process exit

src/lsc/parser.y

@@ -28,6 +28,8 @@ int yywrap()
 
 int main(int argc, char *argv[])
 {
+	int rv;
+
 	argv++; /* skip over program name */
 	argc--;
 	if (argc > 0) {
@@ -60,10 +62,10 @@ int main(int argc, char *argv[])
 			err(1, "%s: Failed to open output file", "out.lc");
 	}
 
-	yyparse();
+	rv = yyparse();
 	fclose(binout);
 	fclose(yyin);
-	return 0;
+	return rv;
 }
 
 %}