getugroups: always close the group DB

[Jim Meyering]

I doubt this would ever be triggered, (a user belonging to 2^31 groups
is unlikely, to say the least), but I'm fixing it regardless:

        Close the group DB even when failing with 2^31 or more members.
        * lib/getugroups.c (getugroups): Don't return without calling endgrent.

Index: lib/getugroups.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/getugroups.c,v
retrieving revision 1.18
diff -u -p -r1.18 getugroups.c
--- lib/getugroups.c    4 Jul 2007 21:46:45 -0000       1.18
+++ lib/getugroups.c    5 Jul 2007 07:27:53 -0000
@@ -84,21 +84,21 @@ getugroups (int maxcount, GETGROUPS_T *g
              if (maxcount != 0)
                {
                  if (count >= maxcount)
-                   {
-                     endgrent ();
-                     return count;
-                   }
+                   goto done;
                  grouplist[count] = grp->gr_gid;
                }
              count++;
              if (count < 0)
                {
                  errno = EOVERFLOW;
-                 return -1;
+                 count = -1;
+                 goto done;
                }
            }
        }
     }
+
+ done:
   endgrent ();

   return count;