SDL: wayland: Fallback to default cursor if chosen one wasn't found

SDL Commits
1 
From 5a4283134542d4bdb3d968a836387a750ce80517 Mon Sep 17 00:00:00 2001
From: Guldoman <[EMAIL REDACTED]>
Date: Wed, 4 Jan 2023 18:47:16 +0100
Subject: [PATCH] wayland: Fallback to default cursor if chosen one wasn't
 found

---
 src/video/wayland/SDL_waylandmouse.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/video/wayland/SDL_waylandmouse.c b/src/video/wayland/SDL_waylandmouse.c
index 11a66c976669..6f07e2a16000 100644
--- a/src/video/wayland/SDL_waylandmouse.c
+++ b/src/video/wayland/SDL_waylandmouse.c
@@ -271,6 +271,14 @@ static SDL_bool wayland_get_system_cursor(SDL_VideoData *vdata, Wayland_CursorDa
         return SDL_FALSE;
     }
 
+    /* Fallback to the default cursor if the chosen one wasn't found */
+    if (!cursor) {
+        cursor = WAYLAND_wl_cursor_theme_get_cursor(theme, "left_ptr");
+        if (!cursor) {
+            return SDL_FALSE;
+        }
+    }
+
     /* ... Set the cursor data, finally. */
     cdata->buffer = WAYLAND_wl_cursor_image_get_buffer(cursor->images[0]);
     cdata->hot_x = cursor->images[0]->hotspot_x;