drm/managed: Clean up GFP_ flag usage in drmm_kmalloc()

This code is not using the correct gfp flags which were passed in.
However, this does not affect runtime because kstrdup_const() is a
no-op in this context.  (It just returns the "kmalloc" string literal
without doing an allocation.)
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/ddf86b59-696a-45f0-96dd-b87aa7b9ab2e@moroto.mountain

drivers/gpu/drm/drm_managed.c

@@ -196,7 +196,7 @@ void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp)
 			       size, gfp);
 		return NULL;
 	}
-	dr->node.name = kstrdup_const("kmalloc", GFP_KERNEL);
+	dr->node.name = kstrdup_const("kmalloc", gfp);
 
 	add_dr(dev, dr);