nvme: add fallback support for block vs char device to verify command

Also the verify commands depends operating on a block device. The kernel
lacks the fallback support in the NVME_IOCTL_IO64_CMD to lookup the
namespace.

Signed-off-by: Daniel Wagner <[email protected]>

Author: igaw

nvme.c

@@ -8539,6 +8539,10 @@ static int verify_cmd(int argc, char **argv, struct command *acmd, struct plugin
 	if (err)
 		return err;
 
+	err = open_fallback_chardev(ctx, cfg.nsid, &hdl);
+	if (err)
+		return err;
+
 	if (cfg.prinfo > 0xf)
 		return -EINVAL;