mfd: cgbc-core: Fix error handling paths in cgbc_init_device()

If an error occurs after a cgbc_session_request() call, it should be
balanced by a corresponding cgbc_session_release(), as already done in the
remove function.

Fixes: 6f1067c ("mfd: Add Congatec Board Controller driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Thomas Richard <thomas.richard@bootlin.com>
Link: https://lore.kernel.org/r/83194335554146efc52c331993f083bd765db6f9.1730205085.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Lee Jones <lee@kernel.org>

Author: tititiou36

drivers/mfd/cgbc-core.c

@@ -321,9 +321,18 @@ static int cgbc_init_device(struct cgbc_device_data *cgbc)
 
 	ret = cgbc_get_version(cgbc);
 	if (ret)
-		return ret;
+		goto release_session;
+
+	ret = mfd_add_devices(cgbc->dev, -1, cgbc_devs, ARRAY_SIZE(cgbc_devs),
+			      NULL, 0, NULL);
+	if (ret)
+		goto release_session;
 
-	return mfd_add_devices(cgbc->dev, -1, cgbc_devs, ARRAY_SIZE(cgbc_devs), NULL, 0, NULL);
+	return 0;
+
+release_session:
+	cgbc_session_release(cgbc);
+	return ret;
 }
 
 static int cgbc_probe(struct platform_device *pdev)