[gdb/cli] Fix return from frame containing inline frame

[gdb/cli] Fix return from frame containing inline frame

Consider test-case gdb.base/return-3.exp:
...
$ gdb -q outputs/gdb.base/return-3/return-3
Reading symbols from outputs/gdb.base/return-3/return-3...
(gdb)
...

Function bar is an inlined function, and consequently we cannot return from
it:
...
(gdb) b bar
Breakpoint 1 at 0x4006ac: file return-3.c, line 25.
(gdb) r
Starting program: return-3
  ...
Breakpoint 1, bar () at return-3.c:25
25        c++;
(gdb) return
Can not force return from an inlined function.
(gdb)
...

However, function foo is not an inline function, and we should be able to
return from it, but we get the same error message:
...
(gdb) up
31        bar ();
(gdb) return
Can not force return from an inlined function.
(gdb)
...

Fix this by using the selected frame rather than the current frame in
return_command, such that we get instead:
...
(gdb) up
31        bar ();
(gdb) return
40        printf ("%d\n", c);
(gdb)
...

Tested on aarch64-linux.

Reviewed-By: Guinevere Larsen <guinevere@redhat.com>
PR cli/32479
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32479