Fixed bug#46811 ini_set() doesn't return false on failure

Zend/tests/bug46811.phpt

@@ -0,0 +1,13 @@
+--TEST--
+ini_set() function
+--INI--
+arg_separator.output=&
+--FILE--
+<?php
+var_dump(ini_set("arg_separator.output", ""));
+var_dump(ini_get("arg_separator.output"));
+?>
+--EXPECT--
+bool(false)
+string(1) "&"
+

Zend/zend_ini.c

@@ -291,6 +291,7 @@ ZEND_API int zend_alter_ini_entry_ex(char *name, uint name_length, char *new_val
 		ini_entry->value_length = new_value_length;
 	} else {
 		efree(duplicate);
+		return FAILURE;
 	}
 
 	return SUCCESS;