Fix memory leaks in mysqlnd debug functionality

Author: nikic

ext/mysqlnd/mysqlnd_debug.c

@@ -699,6 +699,10 @@ MYSQLND_CLASS_METHODS_START(mysqlnd_debug)
 MYSQLND_CLASS_METHODS_END;
 
 
+static void free_ptr(zval *zv) {
+	efree(Z_PTR_P(zv));
+}
+
 /* {{{ mysqlnd_debug_init */
 PHPAPI MYSQLND_DEBUG *
 mysqlnd_debug_init(const char * skip_functions[])
@@ -710,7 +714,7 @@ mysqlnd_debug_init(const char * skip_functions[])
 	zend_stack_init(&ret->call_stack, sizeof(char *));
 	zend_stack_init(&ret->call_time_stack, sizeof(uint64_t));
 	zend_hash_init(&ret->not_filtered_functions, 0, NULL, NULL, 0);
-	zend_hash_init(&ret->function_profiles, 0, NULL, NULL, 0);
+	zend_hash_init(&ret->function_profiles, 0, NULL, free_ptr, 0);
 
 	ret->m = & mysqlnd_mysqlnd_debug_methods;
 	ret->skip_functions = skip_functions;