thermal: imx8mm: Print the correct error code

Currently the error message does not print the correct error code.

Fix it by initializing 'ret' to the proper error code.

Signed-off-by: Fabio Estevam <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/thermal/imx8mm_thermal.c

···
 							     &tmu->sensors[i],
 							     &tmu_tz_ops);
 		if (IS_ERR(tmu->sensors[i].tzd)) {
+			ret = PTR_ERR(tmu->sensors[i].tzd);
 			dev_err(&pdev->dev,
 				"failed to register thermal zone sensor[%d]: %d\n",
 				i, ret);
-			return PTR_ERR(tmu->sensors[i].tzd);
+			return ret;
 		}
 		tmu->sensors[i].hw_id = i;
 	}