Fix readlink related memory leak

Author: cmb69

win32/ioutil.h

@@ -789,12 +789,14 @@ __forceinline static ssize_t php_win32_ioutil_readlink(const char *path, char *b
 
 	ret_buf = php_win32_ioutil_conv_w_to_any(retw, ret, &ret_buf_len);
 	if (!ret_buf || ret_buf_len >= buf_len || ret_buf_len >= MAXPATHLEN) {
+		free(ret_buf);
 		free(pathw);
 		SET_ERRNO_FROM_WIN32_CODE(ERROR_BAD_PATHNAME);
 		return -1;
 	}
 	memcpy(buf, ret_buf, ret_buf_len + 1);
 
+	free(ret_buf);
 	free(pathw);
 
 	return ret_buf_len;