misc: fastrpc: check return value of devm_kasprintf()

devm_kasprintf() returns a pointer to dynamically allocated memory.
Pointer could be NULL in case allocation fails. Check pointer validity.
Identified with coccinelle (kmerr.cocci script).

Fixes: 3abe3ab ("misc: fastrpc: add secure domain support")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230615102546.581899-1-claudiu.beznea@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: claudiubeznea

drivers/misc/fastrpc.c

@@ -2225,6 +2225,9 @@ static int fastrpc_device_register(struct device *dev, struct fastrpc_channel_ct
 	fdev->miscdev.fops = &fastrpc_fops;
 	fdev->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "fastrpc-%s%s",
 					    domain, is_secured ? "-secure" : "");
+	if (!fdev->miscdev.name)
+		return -ENOMEM;
+
 	err = misc_register(&fdev->miscdev);
 	if (!err) {
 		if (is_secured)