MFC r179131 | cperciva | 2008-05-19 11:38:01 -0700 (Mon, 19 May 2008)
MFC r179131 | cperciva | 2008-05-19 11:38:01 -0700 (Mon, 19 May 2008)

Avoid a call to malloc(0) when invoked as 'tar ""'.  This avoids a bizarre
error message when malloc() is set to System V mode (malloc(0) == NULL).

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