[patch] panic executing shell-script

Hi -current,

When executing a shell-script where interpreter-name has 2 or more
trailing whitespace, kernel panics.
E.g. bin/jetty.sh from port www/jetty.

Fix:

--- imgact_shell.c      Thu Jun  9 02:27:02 2005
+++ imgact_shell.c.mj   Sat Jun 18 19:33:00 2005
_at__at_ -161,7 +161,7 _at__at_ exec_shell_imgact(imgp)
        while (ihp < maxp && ((*ihp != '\n') && (*ihp != '\0')))
                ihp++;
        opte = ihp;
-       while (--ihp > interpe && ((*ihp == ' ') || (*ihp == '\t')))
+       while (--ihp > optb && ((*ihp == ' ') || (*ihp == '\t')))
                opte = ihp;

        /*