gdb: remove internalvar_funcs::destroy

No kind of internal var uses it remove it.  This makes the transition to
using a variant easier, since we don't need to think about where this
should be called (in a destructor or not), if it can throw, etc.

Change-Id: Iebbc867d1ce6716480450d9790410d6684cbe4dd

1 files changed, 0 insertions, 1 deletions

diff --git a/gdb/probe.c b/gdb/probe.c
index 278b36c..f0a40f5 100644
--- a/gdb/probe.c
+++ b/gdb/probe.c
@@ -866,7 +866,6 @@ static const struct internalvar_funcs probe_funcs =
 {
   compute_probe_arg,
   compile_probe_arg,
-  NULL
 };