drm/i915: Remove unneeded semicolon

Fixes coccicheck warning:

drivers/gpu/drm/i915/gem/i915_gem_region.c:88:2-3: Unneeded semicolon
drivers/gpu/drm/i915/gvt/gtt.c:1285:2-3: Unneeded semicolon

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/1576467845-60920-1-git-send-email-zhengbin13@huawei.com