sndctl(8): Do not free and re-open device

There was a reason for this, but it does not apply anymore.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D54031

Author: christosmarg

usr.sbin/sndctl/sndctl.c

@@ -992,17 +992,10 @@ main(int argc, char *argv[])
 		argv++;
 	}
 
-	free_dev(dp);
-
 	if (show) {
-		/*
-		 * Re-read dev to reflect new state in case we changed some
-		 * property.
-		 */
-		dp = read_dev(path);
 		print_dev(dp);
-		free_dev(dp);
 	}
+	free_dev(dp);
 
 	return (0);
 }