Merge pull request #955 from r4f4/fix-tplist

tplist: don't fail if no verbosity is supplied

tools/tplist.py

@@ -26,7 +26,7 @@ parser.add_argument("-p", "--pid", type=int, default=None,
         help="List USDT probes in the specified process")
 parser.add_argument("-l", "--lib", default="",
         help="List USDT probes in the specified library or executable")
-parser.add_argument("-v", dest="verbosity", action="count",
+parser.add_argument("-v", dest="verbosity", action="count", default=0,
         help="Increase verbosity level (print variables, arguments, etc.)")
 parser.add_argument(dest="filter", nargs="?",
         help="A filter that specifies which probes/tracepoints to print")