Fixed segfault on empty or directory include.

ChangeLog

@@ -1,3 +1,7 @@
+2007-08-12 Paolo Nenzi <p.nenzi@ieee.org>
+ * src/frontend/inpcom.c: fixed segmentation fault with empty .include file
+   or directory include. This is a hack the full inpcom shoud be rewritten.
+ 
 2007-06-17 Gong Ding <gdiso@ustc.edu>
  * src/spicelib/devices/dev.c: use a more flexiable way to define device.
  If it doesn't work, one can returen to old version (rename as dev_old.c).

src/frontend/inpcom.c

@@ -289,12 +289,13 @@ inp_readall(FILE *fp, struct line **data)
 	    end->li_actual = NULL;
             end->li_line = copy(buffer);
             end->li_linenum = line_number++;
-            end->li_next = newcard;
-
+            if (newcard) {
+                end->li_next = newcard;
             /* Renumber the lines */
 	    for (end = newcard; end && end->li_next; end = end->li_next)
                 end->li_linenum = line_number++;
-	    end->li_linenum = line_number++;	/* SJB - renumber the last line */
+	        end->li_linenum = line_number++;	/* SJB - renumber the last line */
+              }
 
             /* Fix the buffer up a bit. */
             (void) strncpy(buffer + 1, "end of:", 7);