Seems that a glob(undef) triggers an ACCVIO in Perl_flex_stat

Seems that a glob(undef) triggers an ACCVIO in Perl_flex_stat,
when a NULL is passed for the filename string pointer.
From Charles Lane.

p4raw-id: //depot/perl@12381

1 files changed, 1 insertions, 0 deletions

diff --git a/vms/vms.c b/vms/vms.c
index c076809778..fd02f851bd 100644
--- a/vms/vms.c
+++ b/vms/vms.c
@@ -6378,6 +6378,7 @@ Perl_flex_stat(pTHX_ const char *fspec, Stat_t *statbufp)
     char temp_fspec[NAM$C_MAXRSS+300];
     int retval = -1;
 
+    if (!fspec) return retval;
     strcpy(temp_fspec, fspec);
     if (statbufp == (Stat_t *) &PL_statcache)
       do_tovmsspec(temp_fspec,namecache,0);