fix coverity "bug" 184 (false positive)

the contract for wiretap ..._read() functions are that the *err pointer MUST always
be provided as a valid pointer and not a NULL pointer.


ber.c contained a spurios and redundant check for the pointer being non-NULL wich triggered coverity to detect this as a false positive.

this redundant test if the pointer is NULL has been revoved.



svn path=/trunk/; revision=18492

wiretap/ber.c

@@ -83,8 +83,7 @@ static gboolean ber_read(wtap *wth, int *err, gchar **err_info, long *data_offse
   wth->phdr.len = packet_size;
 
   if (fstat(wth->fd, &statb) == -1) {
-    if (err != NULL)
-      *err = errno;
+    *err = errno;
     return FALSE;
   }