apps_user: fix memory leak
memory passed to the ioctl must be deallocated on use if no longer
required
Signed-off-by: 
Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
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memory passed to the ioctl must be deallocated on use if no longer
required
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>