Fix condition in snapshot script. Argv is never 2 long, it can be 3 or 4.

Author: graydon

src/etc/make-snapshot.py

@@ -2,7 +2,7 @@
 
 import snapshot, sys
 
-if len(sys.argv) == 2:
+if len(sys.argv) == 3:
     print(snapshot.make_snapshot(sys.argv[1], sys.argv[2], ""))
 else:
     print(snapshot.make_snapshot(sys.argv[1], sys.argv[2], sys.argv[3]))