media: amphion: delete unnecessary NULL check

vfree(NULL) is safe. NULL check before vfree() is not needed.
Delete them to simplify the code.

Generated by coccinelle script:
	scripts/coccinelle/free/ifnullfree.cocci
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Reviewed-by: ming_qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/amphion/vdec.c

@@ -1369,7 +1369,6 @@ static void vdec_cleanup(struct vpu_inst *inst)
 		return;
 
 	vdec = inst->priv;
-	if (vdec)
 	vfree(vdec);
 	inst->priv = NULL;
 	vfree(inst);

drivers/media/platform/amphion/venc.c

@@ -919,7 +919,6 @@ static void venc_cleanup(struct vpu_inst *inst)
 		return;
 
 	venc = inst->priv;
-	if (venc)
 	vfree(venc);
 	inst->priv = NULL;
 	vfree(inst);

drivers/media/platform/amphion/vpu_cmds.c

@@ -117,7 +117,6 @@ static void vpu_free_cmd(struct vpu_cmd_t *cmd)
 {
 	if (!cmd)
 		return;
-	if (cmd->pkt)
 	vfree(cmd->pkt);
 	vfree(cmd);
 }