SDL: Only save ibus_addr_file after we've successfully read an address from it.

SDL Commits
1 
From bc3d9e99f381072820d29e75e6cc28fe40572c42 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sun, 5 Nov 2023 22:12:37 -0800
Subject: [PATCH] Only save ibus_addr_file after we've successfully read an
 address from it.

Fixes https://github.com/libsdl-org/SDL/issues/3359
---
 src/core/linux/SDL_ibus.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/core/linux/SDL_ibus.c b/src/core/linux/SDL_ibus.c
index 4c1b838635fa..237c300fcd91 100644
--- a/src/core/linux/SDL_ibus.c
+++ b/src/core/linux/SDL_ibus.c
@@ -560,15 +560,17 @@ SDL_bool SDL_IBus_Init(void)
             return SDL_FALSE;
         }
 
-        /* !!! FIXME: if ibus_addr_file != NULL, this will overwrite it and leak (twice!) */
-        ibus_addr_file = SDL_strdup(addr_file);
-
         addr = IBus_ReadAddressFromFile(addr_file);
         if (addr == NULL) {
             SDL_free(addr_file);
             return SDL_FALSE;
         }
 
+        if (ibus_addr_file) {
+            SDL_free(ibus_addr_file);
+        }
+        ibus_addr_file = SDL_strdup(addr_file);
+
         if (inotify_fd < 0) {
             inotify_fd = inotify_init();
             fcntl(inotify_fd, F_SETFL, O_NONBLOCK);