iio: chemical: atlas-sensor: Balance runtime pm + pm_runtime_resume_and_get()

The pm_runtime_put_noidle() call in remove isn't balanced with any get, so
drop it.  Note this isn't a bug as the runtime pm core will not allow the
reference count to go negative, making this a noop. However, it is
confusing to the reader so let's drop it.

pm_runtime_resume_and_get() replacement found using the coccicheck script
under review at:
https://lore.kernel.org/lkml/20210427141946.2478411-1-Julia.Lawall@inria.fr/



As pm_runtime_resume_and_get() returns <= 0 take advantage of that to
change the error checking to if (ret) which is more in keeping with the
rest of this driver.

This is a prequel to taking a closer look at the runtime pm in IIO drivers
in general.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Matt Ranostay <matt.ranostay@konsulko.com>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20210516162103.1332291-4-jic23@kernel.org