Initialize the `lasts' to NULL before calling strtok_r the first time.

With our strtok_r it's not necessary, but the man-page on SGIs says it
should be done.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1791 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/sl/sl.c

@@ -157,7 +157,7 @@ sl_loop (SL_cmd *cmds, char *prompt)
 	    add_history(buf);
 	count = 0;
 	{
-	    char *foo;
+	    char *foo = NULL;
 	    char *p;
 
 	    for(p = strtok_r (buf, " \t", &foo);