Index: main/strings.c
===================================================================
--- main/strings.c	(revision 183627)
+++ main/strings.c	(working copy)
@@ -156,11 +156,10 @@
 			ptr += (*buf)->__AST_STR_STR - oldbase;
 		}
 	}
-	if (__builtin_expect(!(maxsrc && maxlen), 0)) {
+	if (__builtin_expect(!maxlen, 0)) {
 		ptr--;
 	}
 	*ptr = '\0';
-	(*buf)->__AST_STR_USED--;
 	return (*buf)->__AST_STR_STR;
 }