drm/i915/irq: Fix misspelled word register in kernel-doc

There is a typo in the function i915_handle_error()
kernel-doc and the word register is spelled wrongly.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
1 file changed