host1x_debug_init() must be reverted in an error handling path.

This is already fixed in the remove function since commit 44156eee
("gpu: host1x: Clean up debugfs on removal")
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: NThierry Reding <treding@nvidia.com>