modules: move some spa_debug_mem to the log

Instead of dumping to stderr, write it to the log file.

src/modules/module-rtp/midi.c

@@ -315,7 +315,7 @@ short_packet:
 	return -EINVAL;
 invalid_version:
 	pw_log_warn("invalid RTP version");
-	spa_debug_mem(0, buffer, len);
+	spa_debug_log_mem(pw_log_get(), SPA_LOG_LEVEL_INFO, 0, buffer, len);
 	return -EPROTO;
 invalid_len:
 	pw_log_warn("invalid RTP length");