drm/drv: use enum drm_minor_type when appropriate

This makes it easier to figure out what the "type" variable can be
set to when reading the implementation of these functions.

Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by:James Zhu <James.Zhu@amd.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Christian König <christian.koenig@amd.com>
Cc: Marek Olšák <marek.olsak@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20230714104557.518457-1-contact@emersion.fr

drivers/gpu/drm/drm_drv.c

@@ -84,7 +84,7 @@ DEFINE_STATIC_SRCU(drm_unplug_srcu);
  */
 
 static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
-					     unsigned int type)
+					     enum drm_minor_type type)
 {
 	switch (type) {
 	case DRM_MINOR_PRIMARY:
@@ -116,7 +116,7 @@ static void drm_minor_alloc_release(struct drm_device *dev, void *data)
 	}
 }
 
-static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
+static int drm_minor_alloc(struct drm_device *dev, enum drm_minor_type type)
 {
 	struct drm_minor *minor;
 	unsigned long flags;
@@ -160,7 +160,7 @@ static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
 	return 0;
 }
 
-static int drm_minor_register(struct drm_device *dev, unsigned int type)
+static int drm_minor_register(struct drm_device *dev, enum drm_minor_type type)
 {
 	struct drm_minor *minor;
 	unsigned long flags;
@@ -203,7 +203,7 @@ static int drm_minor_register(struct drm_device *dev, unsigned int type)
 	return ret;
 }
 
-static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
+static void drm_minor_unregister(struct drm_device *dev, enum drm_minor_type type)
 {
 	struct drm_minor *minor;
 	unsigned long flags;