gocryptfs-xray: dumpmasterkey: disable "Reading password from stdin"
gocryptfs-xray: dumpmasterkey: disable "Reading password from stdin"

...and also exit with the proper exit code when we get an error.

rfjakob/gocryptfs,davesteele/gocryptfs,rfjakob/gocryptfs,davesteele/gocryptfs,davesteele/gocryptfs,rfjakob/gocryptfs,rfjakob/gocryptfs