drm: ttm: Don't bail from ttm_global_init if debugfs_create_dir fails

In 69de4421 ("drm/ttm: Initialize debugfs from
ttm_global_init()"), ttm_global_init was changed so that if creation
of the debugfs global root directory fails, ttm_global_init will bail
out early and return an error, leading to initialization failure of
DRM drivers. However, not every system will be using debugfs. On such
a system, debugfs directory creation can be expected to fail, but DRM
drivers must still be usable. This changes it so that if creation of
TTM's debugfs root directory fails, then no biggie: keep calm and
carry on.

Fixes: 69de4421 ("drm/ttm: Initialize debugfs from ttm_global_init()")
Signed-off-by: Dan Moulding <dmoulding@me.com>
Tested-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210810195906.22220-2-dmoulding@me.comSigned-off-by: Christian König <christian.koenig@amd.com>

drivers/gpu/drm/ttm/ttm_device.c

@@ -78,9 +78,7 @@ static int ttm_global_init(void)
 
 	ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
 	if (IS_ERR(ttm_debugfs_root)) {
-		ret = PTR_ERR(ttm_debugfs_root);
 		ttm_debugfs_root = NULL;
-		goto out;
 	}
 
 	/* Limit the number of pages in the pool to about 50% of the total