cbfstool/cbfs_image: Fix resource leak for tbuff

Change-Id: I1f4626e1bda92af38e7967d7e05a4c7143942cf6
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/16074
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

util/cbfstool/cbfs_image.c

@@ -889,6 +889,7 @@ static int cbfs_payload_decompress(struct cbfs_payload_segment *segments,
 					&decomp_size)) {
 			ERROR("Couldn't decompress payload segment %u\n", i);
 			buffer_delete(&new_buffer);
+			buffer_delete(&tbuff);
 			return -1;
 		}