nvmem: core: Fix memleak in nvmem_register()

dev_set_name will alloc memory for nvmem->dev.kobj.name in
nvmem_register, when nvmem_validate_keepouts failed, nvmem's
memory will be freed and return, but nobody will free memory
for nvmem->dev.kobj.name, there will be memleak, so moving
nvmem_validate_keepouts() after device_register() and let
the device core deal with cleaning name in error cases.

Fixes: de0534df9347 ("nvmem: core: fix error handling while validating keepout regions")
Cc: [e-mail]
Signed-off-by: Gaosheng Cui <[e-mail]>
Signed-off-by: Srinivas Kandagatla <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/nvmem/core.c

···
 	nvmem->dev.groups = nvmem_dev_groups;
 #endif
 
-	if (nvmem->nkeepout) {
-		rval = nvmem_validate_keepouts(nvmem);
-		if (rval) {
-			ida_free(&nvmem_ida, nvmem->id);
-			kfree(nvmem);
-			return ERR_PTR(rval);
-		}
-	}
-
 	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
 
 	rval = device_register(&nvmem->dev);
 	if (rval)
 		goto err_put_device;
+
+	if (nvmem->nkeepout) {
+		rval = nvmem_validate_keepouts(nvmem);
+		if (rval)
+			goto err_device_del;
+	}
 
 	if (config->compat) {
 		rval = nvmem_sysfs_setup_compat(nvmem, config);