staging: speakup: remove NULL comparison
This was done using cocccinelle script: @@ identifier arg; @@ -arg==NULL +!arg Signed-off-by: Aastha Gupta <aastha.gupta4104@gmail.com> Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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