py: Fix label printing in showbc; print sp in vm trace.
diff --git a/py/vm.c b/py/vm.c
index a2e6a3f..fd9bbf0 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -41,7 +41,7 @@
 #include "objgenerator.h"
 
 #if 0
-#define TRACE(ip) mp_bytecode_print2(ip, 1);
+#define TRACE(ip) printf("sp=" INT_FMT " ", sp - code_state->sp); mp_bytecode_print2(ip, 1);
 #else
 #define TRACE(ip)
 #endif