Fix the same leak with %=

Author: nikic

Zend/tests/compound_shift_string_error.phpt renamed to Zend/tests/compound_assign_with_numeric_strings.phpt

@@ -19,7 +19,13 @@ $n = "-1";
 $n >>= $n;
 var_dump($n);
 
-?>
+$n = "0";
+$n %= $n;
+var_dump($n);
+
+$n = "-1";
+$n %= $n;
+var_dump($n);
 --EXPECTF--
 int(0)
 
@@ -29,3 +35,7 @@ int(0)
 
 Warning: Bit shift by negative number in %s on line %d
 bool(false)
+
+Warning: Division by zero in %s on line %d
+bool(false)
+int(0)

Zend/zend_operators.c

@@ -1143,6 +1143,10 @@ ZEND_API int mod_function(zval *result, zval *op1, zval *op2) /* {{{ */
 	zend_long op1_lval, op2_lval;
 
 	convert_op1_op2_long(op1, op1_lval, op2, op2_lval, ZEND_MOD, mod_function);
+
+	if (op1 == result) {
+		zval_dtor(result);
+	}
 
 	if (op2_lval == 0) {
 		zend_error(E_WARNING, "Division by zero");
@@ -1156,9 +1160,6 @@ ZEND_API int mod_function(zval *result, zval *op1, zval *op2) /* {{{ */
 		return SUCCESS;
 	}
 
-	if (op1 == result) {
-		zval_dtor(result);
-	}
 	ZVAL_LONG(result, op1_lval % op2_lval);
 	return SUCCESS;
 }