scripts/cpu-x86-uarch-abi: fix CLI parsing

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

scripts/cpu-x86-uarch-abi.py

@@ -9,7 +9,7 @@
 from qemu import qmp
 import sys
 
-if len(sys.argv) != 1:
+if len(sys.argv) != 2:
     print("syntax: %s QMP-SOCK\n\n" % __file__ +
           "Where QMP-SOCK points to a QEMU process such as\n\n" +
           " # qemu-system-x86_64 -qmp unix:/tmp/qmp,server,nowait " +
@@ -66,7 +66,6 @@ levels = [
 
 
 sock = sys.argv[1]
-cmd = sys.argv[2]
 shell = qmp.QEMUMonitorProtocol(sock)
 shell.connect()