The devm_gen_pool_create() function returns ERR_PTR() on error, it doesn't return NULL so this check doesn't work.

How do you think about a wording variant like the following?

Change description: A null pointer check was performed after a call of the function “devm_gen_pool_create” despite of the detail that failures are indicated by error pointers instead. Thus adjust a check for the failure predicate and return the corresponding error code.

Regards, Markus