i2c: mux: reg: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/muxes/i2c-mux-reg.c

@@ -171,13 +171,9 @@ static int i2c_mux_reg_probe(struct platform_device *pdev)
 			sizeof(mux->data));
 	} else {
 		ret = i2c_mux_reg_probe_dt(mux, pdev);
-		if (ret == -EPROBE_DEFER)
-			return ret;
-
-		if (ret < 0) {
-			dev_err(&pdev->dev, "Error parsing device tree");
-			return ret;
-		}
+		if (ret < 0)
+			return dev_err_probe(&pdev->dev, ret,
+					     "Error parsing device tree");
 	}
 
 	parent = i2c_get_adapter(mux->data.parent);