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Callers are already checking if the pointer is NULL before using it.

This would be the case if the user hits Ctrl-C once, the application
doesn't quit, and so they hit Ctrl-C again.

This ensures that a valid pix_fmt is set on inputDecoderCtx_

Fixes abort() on failed registration.

Signed-off-by: Tristan Matthews <tristan.matthews@savoirfairelinux.com>

This avoids dead windows hanging around.