fix typo.

* vm_exec.h (DEBUG_END_INSN()): use `ec` instead of `th`.
  This macro is used when `VMDEBUG > 0`.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64799 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_exec.h

@@ -36,7 +36,7 @@ typedef rb_iseq_t *ISEQ;
 #endif
 
 #define DEBUG_END_INSN() \
-  rb_vmdebug_debug_print_post(th, GET_CFP() SC_REGS());
+  rb_vmdebug_debug_print_post(ec, GET_CFP() SC_REGS());
 
 #else