Don't check for null pointer in calls to free

According to the C99 specification section 7.20.3.2 paragraph 2:

> If ptr is a null pointer, no action occurs.

So we do not need to check that the pointer is a null pointer.

1 files changed, 1 insertions, 1 deletions

diff --git a/vm_backtrace.c b/vm_backtrace.c
index 9a041c4c2c..e46eaa5b81 100644
--- a/vm_backtrace.c
+++ b/vm_backtrace.c
@@ -478,7 +478,7 @@ static void
 backtrace_free(void *ptr)
 {
    rb_backtrace_t *bt = (rb_backtrace_t *)ptr;
-   if (bt->backtrace) ruby_xfree(bt->backtrace);
+   ruby_xfree(bt->backtrace);
    ruby_xfree(bt);
 }