drm:remove rebundant word "in" in comments

there is a repeated word "in", so remove it.
Signed-off-by: shaomin Deng <dengshaomin@cdjrlc.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220718150418.7321-1-dengshaomin@cdjrlc.com

drivers/gpu/drm/drm_framebuffer.c

@@ -935,7 +935,7 @@ EXPORT_SYMBOL(drm_framebuffer_unregister_private);
  * the id and get back -EINVAL. Obviously no concern at driver unload time.
  *
  * Also, the framebuffer will not be removed from the lookup idr - for
- * user-created framebuffers this will happen in in the rmfb ioctl. For
+ * user-created framebuffers this will happen in the rmfb ioctl. For
  * driver-private objects (e.g. for fbdev) drivers need to explicitly call
  * drm_framebuffer_unregister_private.
  */