avtools/avconv_hw.c:299: error: Uninitialized Value
  The value read from type was never initialized.

avtools/avconv_hw.c:299:16: 
297.         av_log(ist->dec_ctx, AV_LOG_WARNING, "No device available "
298.                "for decoder (device type %s for codec %s).\n",
299.                av_hwdevice_get_type_name(type), ist->dec->name);
                    ^
300.         return 0;
301.     }
