normal	2018-01-25 07:40:01 +0900 (Thu, 25 Jan 2018)

  New Revision: 62031

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62031

  Log:
    vm.c: remove unnecessary branch
    
    th->altstack is never NULL, and even if it were, POSIX
    stipulates free(3) on NULL to be a no-op.

  Modified files:
    trunk/vm.c
Index: vm.c
===================================================================
--- vm.c	(revision 62030)
+++ vm.c	(revision 62031)
@@ -2439,9 +2439,7 @@ thread_free(void *ptr) https://github.com/ruby/ruby/blob/trunk/vm.c#L2439
     }
     else {
 #ifdef USE_SIGALTSTACK
-	if (th->altstack) {
-	    free(th->altstack);
-	}
+	free(th->altstack);
 #endif
 	ruby_xfree(ptr);
     }

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