eeze disk - remove uneeded extra check for test var

test for non null already done above, so test must obviously be null
here so no need to check. analysers dont like this but it's not a bug.
make them happy thought

found by PVS studio

src/lib/eeze/eeze_disk.c

@@ -52,7 +52,7 @@ _eeze_disk_type_find(Eeze_Disk *disk)
         if (!strcmp(test, "usb")) return EEZE_DISK_TYPE_USB;
         return EEZE_DISK_TYPE_UNKNOWN; /* FIXME */
      }
-   if ((!test) && (!filesystem))
+   if (!filesystem)
      test = _walk_children_get_attr(disk->syspath, "ID_BUS", "block", EINA_TRUE);
    if (!test)
      {