[PATCH] Fix off-by-one in call to vector::reserve

[Tom Tromey <tromey@adacore.com>]

While looking at a bug, I noticed what I think is an off-by-one
mistake in a call to vector::reserve.  This code:

      new_args.reserve (args.size ());
      new_args.push_back
	(value_from_pointer (lookup_pointer_type (values_type), struct_addr));
      new_args.insert (new_args.end (), args.begin (), args.end ());

... reserves 'size()' entries, but then proceeds to push one extra
one.

This shouldn't have any really bad effects, as insert will grow the
vector.  Still, it seems better to use the correct size if we're going
to bother calling reserve.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30780
---
 gdb/infcall.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/infcall.c b/gdb/infcall.c
index bea5b185ddc..7e19be79a24 100644
--- a/gdb/infcall.c
+++ b/gdb/infcall.c
@@ -1233,7 +1233,7 @@ call_function_by_hand_dummy (struct value *function,
   if (return_method == return_method_hidden_param)
     {
       /* Add the new argument to the front of the argument list.  */
-      new_args.reserve (args.size ());
+      new_args.reserve (args.size () + 1);
       new_args.push_back
 	(value_from_pointer (lookup_pointer_type (values_type), struct_addr));
       new_args.insert (new_args.end (), args.begin (), args.end ());
-- 
2.40.1