ecore_drm/ecore_wl2: logging: remove errant usage of %m

ecore_drm/ecore_wl2: logging: remove errant usage of %m

Summary:
printf %m stringifies and prints errno.  I've tried to remove its use
anywhere that the immediately preceding function might not set errno
or is a complicated function for which knowing errno doesn't really
give any useful information.

I've left a few of the drmMode calls because they're just wrappers
around ioctl, which legitimately sets errno.

@fix

Reviewers: zmike, devilhorns

Reviewed By: zmike, devilhorns

Subscribers: cedric, jpeg

Differential Revision: https://phab.enlightenment.org/D3572