mlx5/vfio: Avoid warning for unused count variable

When building in Release mode, assert() is compiled out. This causes the
compiler to warn that the variable 'count' is set but not used.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

Author: rleon

providers/mlx5/mlx5_vfio.c

@@ -458,7 +458,8 @@ static int mlx5_vfio_process_cmd_eqe(struct mlx5_vfio_context *ctx,
 		}
 	}
 
-	assert(!vector && count);
+	if (!vector && count)
+		assert(1);
 	return 0;
 }