nvmem: core: fix return value

Dan Carpenter points out that the return code was not set in commit
60c8b4a ("nvmem: core: fix cleanup after dev_set_name()"), but
this is not the only issue - we also need to zero wp_gpio to prevent
gpiod_put() being called on an error value.

Fixes: 560181d ("nvmem: core: fix cleanup after dev_set_name()")
Cc: [email protected]
Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Russell King (Oracle) <[email protected]>
Signed-off-by: Srinivas Kandagatla <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Russell King (Oracle)

drivers/nvmem/core.c

@@ -783,6 +783,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 						    GPIOD_OUT_HIGH);
 	if (IS_ERR(nvmem->wp_gpio)) {
 		rval = PTR_ERR(nvmem->wp_gpio);
+		nvmem->wp_gpio = NULL;
 		goto err_put_device;
 	}