DB cannot be NULL here.

I checked the history and it doesn't appear that DB was ever passed in
to this function, but always allocated locally.

Found using the STACK tool: http://css.csail.mit.edu/stack/.

osscan.cc

@@ -1194,9 +1194,6 @@ FingerPrintDB *parse_fingerprint_file(const char *fname) {
 
   char *p, *q; /* OH YEAH!!!! */
 
-  if (!DB)
-    fatal("non-allocated DB passed to %s", __func__);
-
   fp = fopen(fname, "r");
   if (!fp)
     fatal("Unable to open Nmap fingerprint file: %s", fname);