drivers: gpu: drm: i915: Fix a typo.

"userpace" -> "userspace"

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 0d051e7..1e30c25 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -664,7 +664,7 @@
 	}
 
 	/* We need to copy these to an anonymous buffer as the simplest
-	 * method to avoid being overwritten by userpace.
+	 * method to avoid being overwritten by userspace.
 	 */
 	error->batchbuffer[0] = i915_error_object_create(dev, batchbuffer[0]);
 	if (batchbuffer[1] != batchbuffer[0])