SDL: Fix read of uninitialised variable

SDL Commits
1 
From 00b95e989b68ca057662263a18a4df576786555a Mon Sep 17 00:00:00 2001
From: Mathieu Eyraud <[EMAIL REDACTED]>
Date: Sat, 18 Jun 2022 16:59:35 +0200
Subject: [PATCH] Fix read of uninitialised variable

If the condition (dbus->message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING) is false, subtext is not initialised.
---
 src/core/linux/SDL_fcitx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/core/linux/SDL_fcitx.c b/src/core/linux/SDL_fcitx.c
index 1ce8bd11f35..c7a735923e4 100644
--- a/src/core/linux/SDL_fcitx.c
+++ b/src/core/linux/SDL_fcitx.c
@@ -105,6 +105,7 @@ Fcitx_GetPreeditString(SDL_DBusContext *dbus,
         dbus->message_iter_recurse(&iter, &array);
         while (dbus->message_iter_get_arg_type(&array) == DBUS_TYPE_STRUCT) {
             dbus->message_iter_recurse(&array, &sub);
+            subtext = NULL;
             if (dbus->message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING) {
                 dbus->message_iter_get_basic(&sub, &subtext);
                 if (subtext && *subtext) {