[Rpm-maint] [rpm-software-management/rpm] Fix rpm2archive behavior with multiple arguments (#681)

[Robbie Harwood]

frozencemetery commented on this pull request.



>  
-    ts = rpmtsFree(ts);
+    if (argc == 1)
+	argv[argc++] = "-";

Per C standard, argv[argc] is always defined to be a NULL pointer.  (Section 5.1.2.2.1, paragraph 2, in ISO/IEC 9899:1999).

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