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Backport more server crash fixes to 21.1 branch

Alan Coopersmith requested to merge alanc/xserver:21.1-backports into server-21.1-branch

All 3 fixes are from @mherrb, from !995 (merged) & !1176 (merged):

  • Don't crash if the client argv or argv[0] is NULL.
  • Return NULL in *cmdname if the client argv or argv[0] is NULL
  • Fix a double-free on syntax error without a new line.

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