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[S390] kprobes: add parameter check to module_free()
When unregistering kprobes, kprobes calls module_free() and always passes NULL for the mod parameter. Add a check to prevent NULL pointer dereferences. See commit 740a8de for more details. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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