io: Fix crash on SDL joystick disconnect #7216
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Check that `pJoystick[i]` is non-null before dereferencing it.
wookieejedi
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Fix a crash on joystick disconnection by checking that
pJoystick[i]is non-null before dereferencing it.(im running into this regularly while disconnecting the session in moonlight/sunshine, which removes a bunch of virtual libevent devices)