On Thu, Sep 13, 2018 at 11:01:15AM +0800, zhong jiang wrote:

remove_extent_mapping use the variable "ret" for return value,
but it is not modified after initialzation. Further, I find that
any of the callers do not handle the return value, so it is safe
to drop the unneeded "ret" and make it to be void function.

Signed-off-by: zhong jiang <redacted>

Reviewed-by: David Sterba <dsterba@suse.com>