drm/omap: Delete useless kfree code

The parameter of kfree function is NULL, so kfree code is useless, delete it.
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201214134628.4937-1-zhengyongjun3@huawei.com

drivers/gpu/drm/omapdrm/tcm-sita.c

@@ -254,6 +254,5 @@ struct tcm *sita_init(u16 width, u16 height)
 	return tcm;
 
 error:
-	kfree(tcm);
 	return NULL;
 }