btrfs-progs: Show error message if btrfs filesystem show failed to find any btrfs filesystem

index 7633f1f..2f78e24 100644
@@ -695,6 +695,7 @@ static int cmd_show(int argc, char **argv)
 		ret = btrfs_scan_kernel(search);
 	if (search && !ret) {
 		/* since search is found we are done */
+		found = 1;
 		goto out;
 	}
 

@@ -729,6 +730,15 @@ devs_only:
 		btrfs_close_devices(fs_devices);
 	}
 out:
+	if (search && !found) {
+		fprintf(stderr,
+			"ERROR: Couldn't find any btrfs filesystem "
+			"matches with '%s'.\n", search);
+		fprintf(stderr,
+			"Please check if both '%s' and the range of scanning "
+			"are correct.\n", search);
+	}
+
 	printf("%s\n", BTRFS_BUILD_VERSION);
 	free_seen_fsid();
 	return ret;