Input: usbtouchscreen - use guard notation when acquiring mutexes
This makes the code more compact and error handling more robust. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20240712051851.3463657-7-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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