drm/xe: Drop unnecessary GT lookup in xe_exec_queue_create_ioctl()

drm/xe: Drop unnecessary GT lookup in xe_exec_queue_create_ioctl()

xe_exec_queue_create_ioctl() performs a lookup of the xe_gt for the GT
ID passed from userspace, but the result is never actually used.  Since
there's already a separate (and earlier) check that the ID passed from
userspace is valid, the unnecessary lookup can be removed.

Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250218200511.4050060-2-matthew.d.roper@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>