Fix required memory size passed to expunge()

The size passed to expunge() must match the size passed to find_block().

Author: madmajestro

apc_sma.c

@@ -449,7 +449,7 @@ PHP_APCU_API void *apc_sma_malloc_ex(apc_sma_t *sma, size_t n, size_t *allocated
 
 	/* Expunge cache in hope of freeing up memory, but only once */
 	if (!nuked) {
-		sma->expunge(*sma->data, n+fragment);
+		sma->expunge(*sma->data, ALIGNWORD(n + ALIGNWORD(sizeof(struct block_t))));
 		nuked = 1;
 		goto restart;
 	}