intel/decoder: free memory in error case

This was handled in other instances in a previous patch, but this
instance remains, as the zlib decompression routine is slightly
different.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34118>

src/intel/decoder/intel_decoder.c

@@ -730,6 +730,7 @@ static uint32_t zlib_inflate(const void *compressed_data,
       case Z_OK:
          break;
       default:
+         free(out);
          inflateEnd(&zstream);
          return 0;
       }