staging: comedi: ni_labpc: move declaration of local var 'irq_flags'

In labpc_ai_cmd(), move the declaration of the local variable
'irq_flags' to remove the need for the extra #ifdef/#endif.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>