trace-cmd: Fixed small memory leak in plugin code
trace-cmd: Fixed small memory leak in plugin code

Thanks again to valgrind in finding some memory leaks in the plugin
code.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd