Remove self-assignment without any effect

clang:

  error: explicitly assigning a variable of type 'uint16_t' (aka 'unsigned short') to itself [-Werror,-Wself-assign]

libs/stfu/stfu.c

@@ -821,7 +821,6 @@ STFU_DECLARE(int32_t) stfu_n_copy_next_frame(stfu_instance_t *jb, uint32_t times
 
 	uint32_t target_ts = 0;
 
-	seq = seq;
 	if (!next_frame) return 0;
 
 	target_ts = timestamp + (distance - 1) * jb->samples_per_packet;