Merge branch '708-possible-segv-null-pointer-deref-in-sanei_configure_attach' into 'master'

Resolve "Possible SEGV (null pointer deref) in sanei_configure_attach()"

Closes #708

See merge request sane-project/backends!802

sanei/sanei_config.c

@@ -295,6 +295,12 @@ sanei_configure_attach (const char *config_file, SANEI_Config * config,
        * So we parse the line 2 time to find an option */
       /* check if it is an option */
       lp = sanei_config_get_string (lp, &token);
+      if (NULL == token)
+        {
+          // Invalid format?
+          continue;
+        }
+
       if (strncmp (token, "option", 6) == 0)
 	{
 	  /* skip the "option" token */