mgetgroups: do not write bytes beyond end of malloc'd buffer

[pspp] / ChangeLog

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+2009-12-10  Jim Meyering  <meyering@redhat.com>
+
+       mgetgroups: do not write bytes beyond end of malloc'd buffer
+       * lib/mgetgroups.c: Fix an off-by-one error.  When we have no
+       username, we call getgroups with a one-element-shorter buffer,
+       but still told it the length was original, max_n_groups.
+
 2009-12-09  Eric Blake  <ebb9@byu.net>
 
        cloexec: relax license