Do not reset cleared count on GC rerun

Author: olsavmic

Zend/zend_gc.c

@@ -1498,7 +1498,7 @@ ZEND_API int zend_gc_collect_cycles(void)
 		gc_scan_roots(&stack);
 
 		GC_TRACE("Collecting roots");
-		count = gc_collect_roots(&gc_flags, &stack);
+		count += gc_collect_roots(&gc_flags, &stack);
 
 		if (!GC_G(num_roots)) {
 			/* nothing to free */