nvme-fc: fold t fc_update_appid into fc_appid_store

No need for this wrapper.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-4-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvme/host/fc.c

@@ -3857,12 +3857,10 @@ static int fc_parse_cgrpid(const char *buf, u64 *id)
 }
 
 /*
- * fc_update_appid: Parse and update the appid in the blkcg associated with
- * cgroupid.
- * @buf: buf contains both cgrpid and appid info
- * @count: size of the buffer
+ * Parse and update the appid in the blkcg associated with the cgroupid.
  */
-static int fc_update_appid(const char *buf, size_t count)
+static ssize_t fc_appid_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
 {
 	u64 cgrp_id;
 	int appid_len = 0;
@@ -3890,17 +3888,6 @@ static int fc_update_appid(const char *buf, size_t count)
 		return ret;
 	return count;
 }
-
-static ssize_t fc_appid_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t count)
-{
-	int ret  = 0;
-
-	ret = fc_update_appid(buf, count);
-	if (ret < 0)
-		return -EINVAL;
-	return count;
-}
 static DEVICE_ATTR(appid_store, 0200, NULL, fc_appid_store);
 #endif /* CONFIG_BLK_CGROUP_FC_APPID */