IB/core: Use memdup_user() rather than duplicating its implementation
* Reuse existing functionality from memdup_user() instead of keeping duplicate source code. This issue was detected by using the Coccinelle software. * The local variable "ret" will be set to an appropriate value a bit later. Thus omit the explicit initialisation at the beginning. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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