Add ZEND_ASSERT to stmt->errorCode

Author: kamil-tekiela

Diff for: ext/pdo/pdo_stmt.c

@@ -1529,9 +1529,7 @@ PHP_METHOD(PDOStatement, errorCode)
 	ZEND_PARSE_PARAMETERS_NONE();
 
 	PHP_STMT_GET_OBJ;
-	if (stmt->error_code[0] == '\0') {
-		RETURN_NULL();
-	}
+	ZEND_ASSERT(stmt->error_code[0] != '\0');
 
 	RETURN_STRING(stmt->error_code);
 }

Diff for: ext/pdo/pdo_stmt.stub.php

@@ -24,7 +24,7 @@ public function columnCount() {}
     /** @return bool|null */
     public function debugDumpParams() {}
 
-    /** @return string|null */
+    /** @return string */
     public function errorCode() {}
 
     /** @return array */

Diff for: ext/pdo/pdo_stmt_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 3bde9f58b85bc33ff6e4414b7802f42e10e4eab0 */
+ * Stub hash: 90e3fbe4a33c7613d279f2942dcd5dc403e68a28 */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_PDOStatement_bindColumn, 0, 0, 2)
 	ZEND_ARG_TYPE_MASK(0, column, MAY_BE_STRING|MAY_BE_LONG, NULL)