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[ Upstream commit8219efd08a] check 'priv->clk' before 'imx_mu_read()' otherwise crash happens on i.mx8ulp, since clock not enabled. Fixes:4f0b776ef5("mailbox: imx-mailbox: support i.MX8ULP MU") Reviewed-by: Jacky Bai <ping.bai@nxp.com> Signed-off-by: Robin Gong <yibin.gong@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>