Fix typo

Accidentially dropped the "!" here.

Author: nikic

Zend/zend_alloc.c

@@ -2801,7 +2801,7 @@ static void alloc_globals_ctor(zend_alloc_globals *alloc_globals)
 
 #if ZEND_MM_CUSTOM
 	tmp = getenv("USE_ZEND_ALLOC");
-	if (tmp && ZEND_ATOL(tmp)) {
+	if (tmp && !ZEND_ATOL(tmp)) {
 		bool tracked = (tmp = getenv("USE_TRACKED_ALLOC")) && ZEND_ATOL(tmp);
 		zend_mm_heap *mm_heap = alloc_globals->mm_heap = malloc(sizeof(zend_mm_heap));
 		memset(mm_heap, 0, sizeof(zend_mm_heap));