x86/ftrace: remove return_to_handler SYM_FUNC_END macro
Fix return_to_handler() so it only uses the intended SYM_CODE_START, SYM_CODE_END macro pair.
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2144901
Signed-off-by: Joe Lawrence joe.lawrence@redhat.com