feat: fix to set perfc feature save argument correctly

Previously incorrect save string poiner set to the argument.

Signed-off-by: Tokunori Ikegami <[email protected]>

Author: ikegami-t

plugins/feat/feat-nvme.c

@@ -168,7 +168,7 @@ static int perfc_set(struct nvme_dev *dev, __u8 fid, __u32 cdw11, struct perfc_c
 		.fd = dev_fd(dev),
 		.fid = fid,
 		.cdw11 = cdw11,
-		.save = save,
+		.save = cfg->save,
 		.timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
 		.result = &result,
 		.data = &data,