i2c: mux: gpmux: 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-gpmux.c

@@ -85,18 +85,14 @@ static int i2c_mux_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	mux->control = devm_mux_control_get(dev, NULL);
-	if (IS_ERR(mux->control)) {
-		if (PTR_ERR(mux->control) != -EPROBE_DEFER)
-			dev_err(dev, "failed to get control-mux\n");
-		return PTR_ERR(mux->control);
-	}
+	if (IS_ERR(mux->control))
+		return dev_err_probe(dev, PTR_ERR(mux->control),
+				     "failed to get control-mux\n");
 
 	parent = mux_parent_adapter(dev);
-	if (IS_ERR(parent)) {
-		if (PTR_ERR(parent) != -EPROBE_DEFER)
-			dev_err(dev, "failed to get i2c-parent adapter\n");
-		return PTR_ERR(parent);
-	}
+	if (IS_ERR(parent))
+		return dev_err_probe(dev, PTR_ERR(parent),
+				     "failed to get i2c-parent adapter\n");
 
 	children = of_get_child_count(np);