[SDL2] Fixed crash if joystick functions are passed a NULL joystick #9234
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In particular this affects the doomsday game engine if no joystick or gamepad is attached.
(cherry picked from commit 0dfdf1f)
[smcv: Also included minor adjustment from #9233]
Backport from SDL3, with #9233 also included. This fixes a crash in the doomsday game engine: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1062969