> But I stumble on another unexpected test result.

I would like point out that the following simple (?) transformation approach
does not generate the expected diff hunk at the moment.

@addition@
expression object;
@@
 object = kzalloc(...)
 ... when any
 device_unregister(...);
 out:
+kfree(object);
 return ERR_PTR(...);


elfring@Sonne:~/Projekte/Linux/next-patched> spatch 
drivers/phy/tegra/xusb-tegra186.c 
~/Projekte/Coccinelle/janitor/add_kfree_call1.cocci


Will further collateral evolution happen then also for the Coccinelle software?

Regards,
Markus
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