In some cases only one bitmap is found when pbm2bm builds the list
of free bitmaps.  Unfortunately the next bitmap pointer doesn't
get initialized in that case causing a crash.  This patch ensures
that the next free bitmap pointer is always initialized.

-- John Wehle
------------------8<------------------------8<------------------------
*** pbm2cl.c.ORIGINAL    Wed Jan 29 07:53:04 2003
--- pbm2cl.c    Tue Apr 29 18:15:29 2008
*************** int pbm2bm(char *f,int reset)
*** 1047,1057 ****
          /* build list of free bitmaps */
          for (i=j=0, la=-1; i<abs; ++i) {
              if (ab[i].x < 0) {
                  if (la < 0)
                      la = j = i;
                  else {
                      ab[j].y = i;
-                     ab[i].y = -1;
                      j = i;
                  }
              }
--- 1047,1057 ----
          /* build list of free bitmaps */
          for (i=j=0, la=-1; i<abs; ++i) {
              if (ab[i].x < 0) {
+                 ab[i].y = -1;
                  if (la < 0)
                      la = j = i;
                  else {
                      ab[j].y = i;
                      j = i;
                  }
              }