x86/traps: Fix typo in do_entry_CP()

x86/traps: Fix typo in do_entry_CP()

The call to debugger_trap_entry() should pass the correct vector.  The
break-for-gdbsx logic is in practice unreachable because PV guests can't
generate #CP, but it will interfere with anyone inserting custom debugging
into debugger_trap_entry().

Fixes: 5ad05b9c2490 ("x86/traps: Implement #CP handler and extend #PF for shadow stacks")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-Acked-by: Ian Jackson <iwj@xenproject.org>