Fix bug in directory traversal.

This off-by-one error resulted in useless reexamination of the

same files by descending twice into each directory.

See:

This fix has already been integrated upstream.

--- pigz-2.3.3/pigz.c.orig 2016-10-03 08:06:26.655873581 +0000

+++ pigz-2.3.3/pigz.c 2016-10-03 08:07:23.222592284 +0000

@@ -4268,7 +4268,7 @@

/* run process() for each entry in the directory */

base = len && g.inf[len - 1] != (unsigned char)'/' ?

- vstrcpy(&g.inf, &g.inz, len, "/") : len;

+ vstrcpy(&g.inf, &g.inz, len, "/") - 1 : len;

for (off = 0; roll[off]; off += strlen(roll + off) + 1) {

vstrcpy(&g.inf, &g.inz, base, roll + off);

process(g.inf);