drm: Correct a typo in a function comment

Replace "pionter" with "pointer" in the drm_gem_handle_create description.

Changes in v2:
- Change subject text
Signed-off-by: NIgor Matheus Andrade Torrente <igormtorrente@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200317210339.2669-1-igormtorrente@gmail.com

drivers/gpu/drm/drm_gem.c

@@ -432,7 +432,7 @@ drm_gem_handle_create_tail(struct drm_file *file_priv,
  * drm_gem_handle_create - create a gem handle for an object
  * @file_priv: drm file-private structure to register the handle for
  * @obj: object to register
- * @handlep: pionter to return the created handle to the caller
+ * @handlep: pointer to return the created handle to the caller
  *
  * Create a handle for this object. This adds a handle reference to the object,
  * which includes a regular reference count. Callers will likely want to