Michael Rash 1e47243574 Bug fix for uninitialized variable found with splint static analyzer
In the save_args() function the args_str_len variable was being used before
being initialized as reported via the splint static code analysis tool.  Here
is the splint output that found this bug:

client/fwknop.c:650:13: Variable args_str_len used before definition
  An rvalue is used that may not be initialized to a value on some execution
  path. (Use -usedef to inhibit warning)
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