mtd: core: Drop duplicate NULL checks around nvmem_unregister()

Since nvmem_unregister() checks for NULL, no need to repeat in
the caller. Drop duplicate NULL checks.
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220220151527.17216-13-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mtd/mtdcore.c

@@ -742,7 +742,6 @@ int del_mtd_device(struct mtd_info *mtd)
 		debugfs_remove_recursive(mtd->dbg.dfs_dir);
 
 		/* Try to remove the NVMEM provider */
-		if (mtd->nvmem)
 		nvmem_unregister(mtd->nvmem);
 
 		device_unregister(&mtd->dev);
@@ -921,7 +920,6 @@ static int mtd_otp_nvmem_add(struct mtd_info *mtd)
 	return 0;
 
 err:
-	if (mtd->otp_user_nvmem)
 	nvmem_unregister(mtd->otp_user_nvmem);
 	return err;
 }
@@ -1026,10 +1024,7 @@ int mtd_device_unregister(struct mtd_info *master)
 		memset(&master->reboot_notifier, 0, sizeof(master->reboot_notifier));
 	}
 
-	if (master->otp_user_nvmem)
 	nvmem_unregister(master->otp_user_nvmem);
-
-	if (master->otp_factory_nvmem)
 	nvmem_unregister(master->otp_factory_nvmem);
 
 	err = del_mtd_partitions(master);